Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | #include <stdio.h> #include <stdlib.h> #define WIDTH 1920 #define HEIGHT 1080 int main() { // Create a new BMP file FILE *f = fopen("flag.bmp", "wb"); // Write the BMP header fprintf(f, "BM"); fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // File size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Reserved fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Offset to image data fputc(40, f); // DIB header size fputc(0, f); fputc(0, f); fputc(0, f); // Width fputc(0, f); fputc(0, f); fputc(0, f); // Height fputc(1, f); // Color planes fputc(0, f); // Bits per pixel fputc(0, f); fputc(0, f); fputc(0, f); // Compression (none) fputc(0, f); fputc(0, f); fputc(0, f); // Image size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); // X pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Y pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Number of colors fputc(0, f); fputc(0, f); fputc(0, f); // Number of important colors fputc(0, f); // Write the image data int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (i < HEIGHT / 13) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 7) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 3) { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } else if (i < HEIGHT / 2) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 2 / 3) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 5 / 6) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } } } // Update the file size in the header fseek(f, 2, SEEK_SET); fputc((HEIGHT * WIDTH * 3 + 14 + 40) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 24) & 0xFF, f); // Update the image size in the header fseek(f, 34, SEEK_SET); fputc((HEIGHT * WIDTH * 3) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 24) & 0xFF, f); // Close the file fclose(f); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | #include <stdio.h> #include <stdlib.h> #define WIDTH 1920 #define HEIGHT 1080 int main() { // Create a new BMP file FILE *f = fopen("flag.bmp", "wb"); // Write the BMP header fprintf(f, "BM"); fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // File size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Reserved fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Offset to image data fputc(40, f); // DIB header size fputc(0, f); fputc(0, f); fputc(0, f); // Width fputc(0, f); fputc(0, f); fputc(0, f); // Height fputc(1, f); // Color planes fputc(0, f); // Bits per pixel fputc(0, f); fputc(0, f); fputc(0, f); // Compression (none) fputc(0, f); fputc(0, f); fputc(0, f); // Image size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); // X pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Y pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Number of colors fputc(0, f); fputc(0, f); fputc(0, f); // Number of important colors fputc(0, f); // Write the image data int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (i < HEIGHT / 13) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 7) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 3) { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } else if (i < HEIGHT / 2) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 2 / 3) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 5 / 6) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } } } // Update the file size in the header fseek(f, 2, SEEK_SET); fputc((HEIGHT * WIDTH * 3 + 14 + 40) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 24) & 0xFF, f); // Update the image size in the header fseek(f, 34, SEEK_SET); fputc((HEIGHT * WIDTH * 3) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 24) & 0xFF, f); // Close the file fclose(f); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | #include <stdio.h> #include <stdlib.h> #define WIDTH 1920 #define HEIGHT 1080 int main() { // Create a new BMP file FILE *f = fopen("flag.bmp", "wb"); // Write the BMP header fprintf(f, "BM"); fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // File size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Reserved fputc(0, f); fputc(0, f); fputc(0, f); fputc(0, f); // Offset to image data fputc(40, f); // DIB header size fputc(0, f); fputc(0, f); fputc(0, f); // Width fputc(0, f); fputc(0, f); fputc(0, f); // Height fputc(1, f); // Color planes fputc(0, f); // Bits per pixel fputc(0, f); fputc(0, f); fputc(0, f); // Compression (none) fputc(0, f); fputc(0, f); fputc(0, f); // Image size (placeholder) fputc(0, f); fputc(0, f); fputc(0, f); // X pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Y pixels per meter fputc(0, f); fputc(0, f); fputc(0, f); // Number of colors fputc(0, f); fputc(0, f); fputc(0, f); // Number of important colors fputc(0, f); // Write the image data int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (i < HEIGHT / 13) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 7) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT / 3) { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } else if (i < HEIGHT / 2) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 2 / 3) { // Blue field fputc(0, f); // Blue fputc(0, f); // Green fputc(255, f); // Red } else if (i < HEIGHT * 5 / 6) { // White stripes fputc(255, f); // Blue fputc(255, f); // Green fputc(255, f); // Red } else { // Red field fputc(255, f); // Blue fputc(0, f); // Green fputc(0, f); // Red } } } // Update the file size in the header fseek(f, 2, SEEK_SET); fputc((HEIGHT * WIDTH * 3 + 14 + 40) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3 + 14 + 40) >> 24) & 0xFF, f); // Update the image size in the header fseek(f, 34, SEEK_SET); fputc((HEIGHT * WIDTH * 3) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 8) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 16) & 0xFF, f); fputc(((HEIGHT * WIDTH * 3) >> 24) & 0xFF, f); // Close the file fclose(f); return 0; } |
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What flag is shown in this image?
cannot identify image file <_io.BytesIO object at 0x7f6879cb32c0>
Testing if the previous output contains the string America
: False
Testing if the previous output contains the string USA
: False
Testing if the previous output contains the string United States
: False
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <stdio.h> int main() { // BMP header printf("BM"); printf("%c%c%c%c", 0x36, 0x00, 0x00, 0x00); // File size (36 bytes) printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c%c%c", 0x28, 0x00, 0x00, 0x00); // Offset to image data (28 bytes) // DIB header printf("%c%c%c%c", 0x40, 0x00, 0x00, 0x00); // DIB header size (40 bytes) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x12); // Image width (18 pixels) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x09); // Image height (9 pixels) printf("%c%c", 0x01, 0x00); // Number of color planes (1) printf("%c%c", 0x01, 0x00); // Bits per pixel (1) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Compression (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Image data size (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Horizontal resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Vertical resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x02); // Number of colors (2) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Important color count (0) // Color palette printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Blue (0) printf("%c%c%c%c", 0xff, 0xff, 0xff, 0x00); // White (255) // Image data for (int y = 0; y < 9; y++) { for (int x = 0; x < 18; x++) { if (y < 5) { printf("%c", 0x00); // Blue } else { printf("%c", 0x01); // White } } } return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <stdio.h> int main() { // BMP header printf("BM"); printf("%c%c%c%c", 0x36, 0x00, 0x00, 0x00); // File size (36 bytes) printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c%c%c", 0x28, 0x00, 0x00, 0x00); // Offset to image data (28 bytes) // DIB header printf("%c%c%c%c", 0x40, 0x00, 0x00, 0x00); // DIB header size (40 bytes) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x12); // Image width (18 pixels) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x09); // Image height (9 pixels) printf("%c%c", 0x01, 0x00); // Number of color planes (1) printf("%c%c", 0x01, 0x00); // Bits per pixel (1) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Compression (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Image data size (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Horizontal resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Vertical resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x02); // Number of colors (2) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Important color count (0) // Color palette printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Blue (0) printf("%c%c%c%c", 0xff, 0xff, 0xff, 0x00); // White (255) // Image data for (int y = 0; y < 9; y++) { for (int x = 0; x < 18; x++) { if (y < 5) { printf("%c", 0x00); // Blue } else { printf("%c", 0x01); // White } } } return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <stdio.h> int main() { // BMP header printf("BM"); printf("%c%c%c%c", 0x36, 0x00, 0x00, 0x00); // File size (36 bytes) printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c", 0x00, 0x00); // Reserved printf("%c%c%c%c", 0x28, 0x00, 0x00, 0x00); // Offset to image data (28 bytes) // DIB header printf("%c%c%c%c", 0x40, 0x00, 0x00, 0x00); // DIB header size (40 bytes) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x12); // Image width (18 pixels) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x09); // Image height (9 pixels) printf("%c%c", 0x01, 0x00); // Number of color planes (1) printf("%c%c", 0x01, 0x00); // Bits per pixel (1) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Compression (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Image data size (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Horizontal resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Vertical resolution (0) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x02); // Number of colors (2) printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Important color count (0) // Color palette printf("%c%c%c%c", 0x00, 0x00, 0x00, 0x00); // Blue (0) printf("%c%c%c%c", 0xff, 0xff, 0xff, 0x00); // White (255) // Image data for (int y = 0; y < 9; y++) { for (int x = 0; x < 18; x++) { if (y < 5) { printf("%c", 0x00); // Blue } else { printf("%c", 0x01); // White } } } return 0; } |
b'BM6\x00\x00\x00\x00\x00\x00\x00(\x00\x00\x00@\x00\x00\x00\x00\x00\x00\x12\x00\x00\x00\t\x01\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01'
What flag is shown in this image?
Unsupported BMP Palette size (33554432)
Testing if the previous output contains the string America
: False
Testing if the previous output contains the string USA
: False
Testing if the previous output contains the string United States
: False
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #include <stdio.h> #include <stdlib.h> // 13 stars wide, 7 stars tall #define STAR_WIDTH 13 #define STAR_HEIGHT 7 // 7 stripes tall #define STRIPE_HEIGHT 7 // Colors #define WHITE 0xFFFFFFFF #define BLUE 0xFF0000FF #define RED 0xFFFF0000 // Function to write a 32-bit integer to a file void write_int(FILE *fp, uint32_t value) { fwrite(&value, sizeof(uint32_t), 1, fp); } // Function to write a 16-bit integer to a file void write_short(FILE *fp, uint16_t value) { fwrite(&value, sizeof(uint16_t), 1, fp); } // Function to write a byte to a file void write_byte(FILE *fp, uint8_t value) { fwrite(&value, sizeof(uint8_t), 1, fp); } // Function to write a BMP header to a file void write_bmp_header(FILE *fp, int width, int height) { // BMP header write_byte(fp, 'B'); write_byte(fp, 'M'); write_int(fp, 14 + 40 + width * height * 4); // File size write_int(fp, 0); // Reserved write_int(fp, 14 + 40); // Offset to image data // DIB header write_int(fp, 40); // Size of DIB header write_int(fp, width); // Image width write_int(fp, height); // Image height write_short(fp, 1); // Number of color planes write_short(fp, 32); // Number of bits per pixel write_int(fp, 0); // Compression type write_int(fp, width * height * 4); // Image size write_int(fp, 2835); // Horizontal resolution write_int(fp, 2835); // Vertical resolution write_int(fp, 0); // Number of colors in palette write_int(fp, 0); // Number of important colors } // Function to write an American flag to a BMP file void write_american_flag(FILE *fp, int width, int height) { // Write the BMP header write_bmp_header(fp, width, height); // Create a buffer to store the image data uint32_t *buffer = malloc(width * height * sizeof(uint32_t)); // Fill the buffer with white for (int i = 0; i < width * height; i++) { buffer[i] = WHITE; } // Draw the stars for (int i = 0; i < STAR_WIDTH; i++) { for (int j = 0; j < STAR_HEIGHT; j++) { // Calculate the position of the star int x = i * width / STAR_WIDTH; int y = j * height / STAR_HEIGHT; // Draw the star for (int k = 0; k < 5; k++) { int dx = k - 2; int dy = k - 2; int r = 2; // Check if the pixel is within the circle if (dx * dx + dy * dy <= r * r) { // Set the pixel to blue buffer[x + dx + (y + dy) * width] = BLUE; } } } } // Draw the stripes for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { // Calculate the position of the pixel int x = j; int y = i; // Check if the pixel is within a stripe if (y % STRIPE_HEIGHT < 3) { // Set the pixel to red buffer[x + y * width] = RED; } else if (y % STRIPE_HEIGHT >= 3 && y % STRIPE_HEIGHT < 6) { // Set the pixel to white buffer[x + y * width] = WHITE; } } } // Write the image data to the file fwrite(buffer, width * height * sizeof(uint32_t), 1, fp); // Free the buffer free(buffer); } int main() { // Open the output file FILE *fp = fopen("american_flag.bmp", "wb"); // Write the American flag to the file write_american_flag(fp, 800, 400); // Close the file fclose(fp); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #include <stdio.h> #include <stdlib.h> // 13 stars wide, 7 stars tall #define STAR_WIDTH 13 #define STAR_HEIGHT 7 // 7 stripes tall #define STRIPE_HEIGHT 7 // Colors #define WHITE 0xFFFFFFFF #define BLUE 0xFF0000FF #define RED 0xFFFF0000 // Function to write a 32-bit integer to a file void write_int(FILE *fp, uint32_t value) { fwrite(&value, sizeof(uint32_t), 1, fp); } // Function to write a 16-bit integer to a file void write_short(FILE *fp, uint16_t value) { fwrite(&value, sizeof(uint16_t), 1, fp); } // Function to write a byte to a file void write_byte(FILE *fp, uint8_t value) { fwrite(&value, sizeof(uint8_t), 1, fp); } // Function to write a BMP header to a file void write_bmp_header(FILE *fp, int width, int height) { // BMP header write_byte(fp, 'B'); write_byte(fp, 'M'); write_int(fp, 14 + 40 + width * height * 4); // File size write_int(fp, 0); // Reserved write_int(fp, 14 + 40); // Offset to image data // DIB header write_int(fp, 40); // Size of DIB header write_int(fp, width); // Image width write_int(fp, height); // Image height write_short(fp, 1); // Number of color planes write_short(fp, 32); // Number of bits per pixel write_int(fp, 0); // Compression type write_int(fp, width * height * 4); // Image size write_int(fp, 2835); // Horizontal resolution write_int(fp, 2835); // Vertical resolution write_int(fp, 0); // Number of colors in palette write_int(fp, 0); // Number of important colors } // Function to write an American flag to a BMP file void write_american_flag(FILE *fp, int width, int height) { // Write the BMP header write_bmp_header(fp, width, height); // Create a buffer to store the image data uint32_t *buffer = malloc(width * height * sizeof(uint32_t)); // Fill the buffer with white for (int i = 0; i < width * height; i++) { buffer[i] = WHITE; } // Draw the stars for (int i = 0; i < STAR_WIDTH; i++) { for (int j = 0; j < STAR_HEIGHT; j++) { // Calculate the position of the star int x = i * width / STAR_WIDTH; int y = j * height / STAR_HEIGHT; // Draw the star for (int k = 0; k < 5; k++) { int dx = k - 2; int dy = k - 2; int r = 2; // Check if the pixel is within the circle if (dx * dx + dy * dy <= r * r) { // Set the pixel to blue buffer[x + dx + (y + dy) * width] = BLUE; } } } } // Draw the stripes for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { // Calculate the position of the pixel int x = j; int y = i; // Check if the pixel is within a stripe if (y % STRIPE_HEIGHT < 3) { // Set the pixel to red buffer[x + y * width] = RED; } else if (y % STRIPE_HEIGHT >= 3 && y % STRIPE_HEIGHT < 6) { // Set the pixel to white buffer[x + y * width] = WHITE; } } } // Write the image data to the file fwrite(buffer, width * height * sizeof(uint32_t), 1, fp); // Free the buffer free(buffer); } int main() { // Open the output file FILE *fp = fopen("american_flag.bmp", "wb"); // Write the American flag to the file write_american_flag(fp, 800, 400); // Close the file fclose(fp); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #include <stdio.h> #include <stdlib.h> // 13 stars wide, 7 stars tall #define STAR_WIDTH 13 #define STAR_HEIGHT 7 // 7 stripes tall #define STRIPE_HEIGHT 7 // Colors #define WHITE 0xFFFFFFFF #define BLUE 0xFF0000FF #define RED 0xFFFF0000 // Function to write a 32-bit integer to a file void write_int(FILE *fp, uint32_t value) { fwrite(&value, sizeof(uint32_t), 1, fp); } // Function to write a 16-bit integer to a file void write_short(FILE *fp, uint16_t value) { fwrite(&value, sizeof(uint16_t), 1, fp); } // Function to write a byte to a file void write_byte(FILE *fp, uint8_t value) { fwrite(&value, sizeof(uint8_t), 1, fp); } // Function to write a BMP header to a file void write_bmp_header(FILE *fp, int width, int height) { // BMP header write_byte(fp, 'B'); write_byte(fp, 'M'); write_int(fp, 14 + 40 + width * height * 4); // File size write_int(fp, 0); // Reserved write_int(fp, 14 + 40); // Offset to image data // DIB header write_int(fp, 40); // Size of DIB header write_int(fp, width); // Image width write_int(fp, height); // Image height write_short(fp, 1); // Number of color planes write_short(fp, 32); // Number of bits per pixel write_int(fp, 0); // Compression type write_int(fp, width * height * 4); // Image size write_int(fp, 2835); // Horizontal resolution write_int(fp, 2835); // Vertical resolution write_int(fp, 0); // Number of colors in palette write_int(fp, 0); // Number of important colors } // Function to write an American flag to a BMP file void write_american_flag(FILE *fp, int width, int height) { // Write the BMP header write_bmp_header(fp, width, height); // Create a buffer to store the image data uint32_t *buffer = malloc(width * height * sizeof(uint32_t)); // Fill the buffer with white for (int i = 0; i < width * height; i++) { buffer[i] = WHITE; } // Draw the stars for (int i = 0; i < STAR_WIDTH; i++) { for (int j = 0; j < STAR_HEIGHT; j++) { // Calculate the position of the star int x = i * width / STAR_WIDTH; int y = j * height / STAR_HEIGHT; // Draw the star for (int k = 0; k < 5; k++) { int dx = k - 2; int dy = k - 2; int r = 2; // Check if the pixel is within the circle if (dx * dx + dy * dy <= r * r) { // Set the pixel to blue buffer[x + dx + (y + dy) * width] = BLUE; } } } } // Draw the stripes for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { // Calculate the position of the pixel int x = j; int y = i; // Check if the pixel is within a stripe if (y % STRIPE_HEIGHT < 3) { // Set the pixel to red buffer[x + y * width] = RED; } else if (y % STRIPE_HEIGHT >= 3 && y % STRIPE_HEIGHT < 6) { // Set the pixel to white buffer[x + y * width] = WHITE; } } } // Write the image data to the file fwrite(buffer, width * height * sizeof(uint32_t), 1, fp); // Free the buffer free(buffer); } int main() { // Open the output file FILE *fp = fopen("american_flag.bmp", "wb"); // Write the American flag to the file write_american_flag(fp, 800, 400); // Close the file fclose(fp); return 0; } |
b"main.c:18:26: error: unknown type name 'uint32_t'\n 18 | void write_int(FILE *fp, uint32_t value) {\n | ^~~~~~~~\nmain.c:4:1: note: 'uint32_t' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?\n 3 | #include <stdlib.h>\n +++ |+#include <stdint.h>\n 4 | \nmain.c:23:28: error: unknown type name 'uint16_t'\n 23 | void write_short(FILE *fp, uint16_t value) {\n | ^~~~~~~~\nmain.c:23:28: note: 'uint16_t' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?\nmain.c:28:27: error: unknown type name 'uint8_t'\n 28 | void write_byte(FILE *fp, uint8_t value) {\n | ^~~~~~~\nmain.c:28:27: note: 'uint8_t' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?\nmain.c: In function 'write_bmp_header':\nmain.c:35:5: warning: implicit declaration of function 'write_byte' [-Wimplicit-function-declaration]\n 35 | write_byte(fp, 'B');\n | ^~~~~~~~~~\nmain.c:37:5: warning: implicit declaration of function 'write_int' [-Wimplicit-function-declaration]\n 37 | write_int(fp, 14 + 40 + width * height * 4); // File size\n | ^~~~~~~~~\nmain.c:45:5: warning: implicit declaration of function 'write_short' [-Wimplicit-function-declaration]\n 45 | write_short(fp, 1); // Number of color planes\n | ^~~~~~~~~~~\nmain.c: In function 'write_american_flag':\nmain.c:61:5: error: unknown type name 'uint32_t'\n 61 | uint32_t *buffer = malloc(width * height * sizeof(uint32_t));\n | ^~~~~~~~\nmain.c:61:5: note: 'uint32_t' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?\nmain.c:61:55: error: 'uint32_t' undeclared (first use in this function)\n 61 | uint32_t *buffer = malloc(width * height * sizeof(uint32_t));\n | ^~~~~~~~\nmain.c:61:55: note: 'uint32_t' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?\nmain.c:61:55: note: each undeclared identifier is reported only once for each function it appears in\nmain.sh: line 2: ./a.out: No such file or directory\n"
What flag is shown in this image?
cannot identify image file <_io.BytesIO object at 0x7fd7502fd1d0>
Testing if the previous output contains the string America
: False
Testing if the previous output contains the string USA
: False
Testing if the previous output contains the string United States
: False
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | #include <stdio.h> #include <stdlib.h> typedef struct { unsigned char r, g, b; } Color; typedef struct { unsigned int width, height; Color *pixels; } Image; Image *create_image(unsigned int width, unsigned int height) { Image *image = malloc(sizeof(Image)); image->width = width; image->height = height; image->pixels = malloc(width * height * sizeof(Color)); return image; } void destroy_image(Image *image) { free(image->pixels); free(image); } void set_pixel(Image *image, unsigned int x, unsigned int y, Color color) { image->pixels[y * image->width + x] = color; } void write_bmp(Image *image, FILE *file) { unsigned int filesize = 14 + 40 + image->width * image->height * 3; unsigned int headersize = 40; unsigned int planes = 1; unsigned int bitcount = 24; unsigned int compression = 0; unsigned int imagesize = image->width * image->height * 3; unsigned int xpixelsperm = 0; unsigned int ypixelsperm = 0; unsigned int importantcolors = 0; // Write the file header. fprintf(file, "BM"); fwrite(&filesize, sizeof(unsigned int), 1, file); fwrite(&headersize, sizeof(unsigned int), 1, file); // Write the bitmap header. fwrite(&headersize, sizeof(unsigned int), 1, file); fwrite(&image->width, sizeof(unsigned int), 1, file); fwrite(&image->height, sizeof(unsigned int), 1, file); fwrite(&planes, sizeof(unsigned int), 1, file); fwrite(&bitcount, sizeof(unsigned int), 1, file); fwrite(&compression, sizeof(unsigned int), 1, file); fwrite(&imagesize, sizeof(unsigned int), 1, file); fwrite(&xpixelsperm, sizeof(unsigned int), 1, file); fwrite(&ypixelsperm, sizeof(unsigned int), 1, file); fwrite(&importantcolors, sizeof(unsigned int), 1, file); // Write the pixel data. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { Color color = image->pixels[y * image->width + x]; fwrite(&color.b, sizeof(unsigned char), 1, file); fwrite(&color.g, sizeof(unsigned char), 1, file); fwrite(&color.r, sizeof(unsigned char), 1, file); } } } int main() { // Create an image. Image *image = create_image(1920, 1080); // Fill the image with white. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } // Draw the stars. for (unsigned int y = 0; y < image->height / 12; y++) { for (unsigned int x = 0; x < image->width / 16; x++) { if ((x + y) % 2 == 0) { set_pixel(image, x * 16 + 8, y * 12 + 6, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 7, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 10, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 7, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 9, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 6, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 10, y * 12 + 9, (Color) {0, 0, 0}); } } } // Draw the stripes. for (unsigned int y = 0; y < image->height; y++) { if (y % 13 < 7) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {194, 30, 52}); } } else { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } } // Write the image to a file. write_bmp(image, stdout); // Destroy the image. destroy_image(image); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | #include <stdio.h> #include <stdlib.h> typedef struct { unsigned char r, g, b; } Color; typedef struct { unsigned int width, height; Color *pixels; } Image; Image *create_image(unsigned int width, unsigned int height) { Image *image = malloc(sizeof(Image)); image->width = width; image->height = height; image->pixels = malloc(width * height * sizeof(Color)); return image; } void destroy_image(Image *image) { free(image->pixels); free(image); } void set_pixel(Image *image, unsigned int x, unsigned int y, Color color) { image->pixels[y * image->width + x] = color; } void write_bmp(Image *image, FILE *file) { unsigned int filesize = 14 + 40 + image->width * image->height * 3; unsigned int headersize = 40; unsigned int planes = 1; unsigned int bitcount = 24; unsigned int compression = 0; unsigned int imagesize = image->width * image->height * 3; unsigned int xpixelsperm = 0; unsigned int ypixelsperm = 0; unsigned int importantcolors = 0; // Write the file header. fprintf(file, "BM"); fwrite(&filesize, sizeof(unsigned int), 1, file); fwrite(&headersize, sizeof(unsigned int), 1, file); // Write the bitmap header. fwrite(&headersize, sizeof(unsigned int), 1, file); fwrite(&image->width, sizeof(unsigned int), 1, file); fwrite(&image->height, sizeof(unsigned int), 1, file); fwrite(&planes, sizeof(unsigned int), 1, file); fwrite(&bitcount, sizeof(unsigned int), 1, file); fwrite(&compression, sizeof(unsigned int), 1, file); fwrite(&imagesize, sizeof(unsigned int), 1, file); fwrite(&xpixelsperm, sizeof(unsigned int), 1, file); fwrite(&ypixelsperm, sizeof(unsigned int), 1, file); fwrite(&importantcolors, sizeof(unsigned int), 1, file); // Write the pixel data. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { Color color = image->pixels[y * image->width + x]; fwrite(&color.b, sizeof(unsigned char), 1, file); fwrite(&color.g, sizeof(unsigned char), 1, file); fwrite(&color.r, sizeof(unsigned char), 1, file); } } } int main() { // Create an image. Image *image = create_image(1920, 1080); // Fill the image with white. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } // Draw the stars. for (unsigned int y = 0; y < image->height / 12; y++) { for (unsigned int x = 0; x < image->width / 16; x++) { if ((x + y) % 2 == 0) { set_pixel(image, x * 16 + 8, y * 12 + 6, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 7, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 10, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 7, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 9, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 6, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 10, y * 12 + 9, (Color) {0, 0, 0}); } } } // Draw the stripes. for (unsigned int y = 0; y < image->height; y++) { if (y % 13 < 7) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {194, 30, 52}); } } else { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } } // Write the image to a file. write_bmp(image, stdout); // Destroy the image. destroy_image(image); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | #include <stdio.h> #include <stdlib.h> typedef struct { unsigned char r, g, b; } Color; typedef struct { unsigned int width, height; Color *pixels; } Image; Image *create_image(unsigned int width, unsigned int height) { Image *image = malloc(sizeof(Image)); image->width = width; image->height = height; image->pixels = malloc(width * height * sizeof(Color)); return image; } void destroy_image(Image *image) { free(image->pixels); free(image); } void set_pixel(Image *image, unsigned int x, unsigned int y, Color color) { image->pixels[y * image->width + x] = color; } void write_bmp(Image *image, FILE *file) { unsigned int filesize = 14 + 40 + image->width * image->height * 3; unsigned int headersize = 40; unsigned int planes = 1; unsigned int bitcount = 24; unsigned int compression = 0; unsigned int imagesize = image->width * image->height * 3; unsigned int xpixelsperm = 0; unsigned int ypixelsperm = 0; unsigned int importantcolors = 0; // Write the file header. fprintf(file, "BM"); fwrite(&filesize, sizeof(unsigned int), 1, file); fwrite(&headersize, sizeof(unsigned int), 1, file); // Write the bitmap header. fwrite(&headersize, sizeof(unsigned int), 1, file); fwrite(&image->width, sizeof(unsigned int), 1, file); fwrite(&image->height, sizeof(unsigned int), 1, file); fwrite(&planes, sizeof(unsigned int), 1, file); fwrite(&bitcount, sizeof(unsigned int), 1, file); fwrite(&compression, sizeof(unsigned int), 1, file); fwrite(&imagesize, sizeof(unsigned int), 1, file); fwrite(&xpixelsperm, sizeof(unsigned int), 1, file); fwrite(&ypixelsperm, sizeof(unsigned int), 1, file); fwrite(&importantcolors, sizeof(unsigned int), 1, file); // Write the pixel data. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { Color color = image->pixels[y * image->width + x]; fwrite(&color.b, sizeof(unsigned char), 1, file); fwrite(&color.g, sizeof(unsigned char), 1, file); fwrite(&color.r, sizeof(unsigned char), 1, file); } } } int main() { // Create an image. Image *image = create_image(1920, 1080); // Fill the image with white. for (unsigned int y = 0; y < image->height; y++) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } // Draw the stars. for (unsigned int y = 0; y < image->height / 12; y++) { for (unsigned int x = 0; x < image->width / 16; x++) { if ((x + y) % 2 == 0) { set_pixel(image, x * 16 + 8, y * 12 + 6, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 7, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 8, y * 12 + 10, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 7, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 9, y * 12 + 8, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 6, y * 12 + 9, (Color) {0, 0, 0}); set_pixel(image, x * 16 + 10, y * 12 + 9, (Color) {0, 0, 0}); } } } // Draw the stripes. for (unsigned int y = 0; y < image->height; y++) { if (y % 13 < 7) { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {194, 30, 52}); } } else { for (unsigned int x = 0; x < image->width; x++) { set_pixel(image, x, y, (Color) {255, 255, 255}); } } } // Write the image to a file. write_bmp(image, stdout); // Destroy the image. destroy_image(image); return 0; } |
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
What flag is shown in this image?
Unsupported BMP header type (1920)
Testing if the previous output contains the string America
: False
Testing if the previous output contains the string USA
: False
Testing if the previous output contains the string United States
: False
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an american flag to stdout.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | #include <stdio.h> #include <stdlib.h> #include <string.h> #define WIDTH 640 #define HEIGHT 480 typedef struct { unsigned char blue; unsigned char green; unsigned char red; } Pixel; typedef struct { unsigned char signature[2]; /* "BM" */ unsigned int filesize; unsigned int reserved; unsigned int data_offset; unsigned int header_size; unsigned int width; unsigned int height; unsigned short int planes; unsigned short int bits_per_pixel; unsigned int compression_method; unsigned int raw_data_size; unsigned int horizontal_resolution; unsigned int vertical_resolution; unsigned int num_colors; unsigned int important_colors; } BitmapHeader; int main() { BitmapHeader header = { .signature = {'B', 'M'}, .filesize = sizeof(BitmapHeader) + (WIDTH * HEIGHT * 3), .reserved = 0, .data_offset = sizeof(BitmapHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression_method = 0, .raw_data_size = WIDTH * HEIGHT * 3, .horizontal_resolution = 0, .vertical_resolution = 0, .num_colors = 0, .important_colors = 0 }; Pixel pixels[WIDTH * HEIGHT]; // Draw the flag int x, y; for (y = 0; y < HEIGHT; y++) { for (x = 0; x < WIDTH; x++) { if (y < HEIGHT / 3) { // Blue pixels[y * WIDTH + x].blue = 0; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 255; } else if (y < 2 * HEIGHT / 3) { // White pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 255; pixels[y * WIDTH + x].red = 255; } else { // Red pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 0; } } } // Write the header fwrite(&header, sizeof(BitmapHeader), 1, stdout); // Write the pixels fwrite(pixels, sizeof(Pixel), WIDTH * HEIGHT, stdout); return 0; } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | C #include <stdio.h> #include <stdlib.h> #include <string.h> #define WIDTH 640 #define HEIGHT 480 typedef struct { unsigned char blue; unsigned char green; unsigned char red; } Pixel; typedef struct { unsigned char signature[2]; /* "BM" */ unsigned int filesize; unsigned int reserved; unsigned int data_offset; unsigned int header_size; unsigned int width; unsigned int height; unsigned short int planes; unsigned short int bits_per_pixel; unsigned int compression_method; unsigned int raw_data_size; unsigned int horizontal_resolution; unsigned int vertical_resolution; unsigned int num_colors; unsigned int important_colors; } BitmapHeader; int main() { BitmapHeader header = { .signature = {'B', 'M'}, .filesize = sizeof(BitmapHeader) + (WIDTH * HEIGHT * 3), .reserved = 0, .data_offset = sizeof(BitmapHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression_method = 0, .raw_data_size = WIDTH * HEIGHT * 3, .horizontal_resolution = 0, .vertical_resolution = 0, .num_colors = 0, .important_colors = 0 }; Pixel pixels[WIDTH * HEIGHT]; // Draw the flag int x, y; for (y = 0; y < HEIGHT; y++) { for (x = 0; x < WIDTH; x++) { if (y < HEIGHT / 3) { // Blue pixels[y * WIDTH + x].blue = 0; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 255; } else if (y < 2 * HEIGHT / 3) { // White pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 255; pixels[y * WIDTH + x].red = 255; } else { // Red pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 0; } } } // Write the header fwrite(&header, sizeof(BitmapHeader), 1, stdout); // Write the pixels fwrite(pixels, sizeof(Pixel), WIDTH * HEIGHT, stdout); return 0; } |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | C #include <stdio.h> #include <stdlib.h> #include <string.h> #define WIDTH 640 #define HEIGHT 480 typedef struct { unsigned char blue; unsigned char green; unsigned char red; } Pixel; typedef struct { unsigned char signature[2]; /* "BM" */ unsigned int filesize; unsigned int reserved; unsigned int data_offset; unsigned int header_size; unsigned int width; unsigned int height; unsigned short int planes; unsigned short int bits_per_pixel; unsigned int compression_method; unsigned int raw_data_size; unsigned int horizontal_resolution; unsigned int vertical_resolution; unsigned int num_colors; unsigned int important_colors; } BitmapHeader; int main() { BitmapHeader header = { .signature = {'B', 'M'}, .filesize = sizeof(BitmapHeader) + (WIDTH * HEIGHT * 3), .reserved = 0, .data_offset = sizeof(BitmapHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression_method = 0, .raw_data_size = WIDTH * HEIGHT * 3, .horizontal_resolution = 0, .vertical_resolution = 0, .num_colors = 0, .important_colors = 0 }; Pixel pixels[WIDTH * HEIGHT]; // Draw the flag int x, y; for (y = 0; y < HEIGHT; y++) { for (x = 0; x < WIDTH; x++) { if (y < HEIGHT / 3) { // Blue pixels[y * WIDTH + x].blue = 0; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 255; } else if (y < 2 * HEIGHT / 3) { // White pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 255; pixels[y * WIDTH + x].red = 255; } else { // Red pixels[y * WIDTH + x].blue = 255; pixels[y * WIDTH + x].green = 0; pixels[y * WIDTH + x].red = 0; } } } // Write the header fwrite(&header, sizeof(BitmapHeader), 1, stdout); // Write the pixels fwrite(pixels, sizeof(Pixel), WIDTH * HEIGHT, stdout); return 0; } |
b"main.c:1:2: error: expected ';' before 'typedef'\n 1 | C\n | ^\n | ;\nmain.sh: line 2: ./a.out: No such file or directory\n"
What flag is shown in this image?
cannot identify image file <_io.BytesIO object at 0x7f662fe30860>
Testing if the previous output contains the string America
: False
Testing if the previous output contains the string USA
: False
Testing if the previous output contains the string United States
: False