Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Here is a C program that generates and prints an Italian flag image in BMP format 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE_OFFSET 2 #define PIXEL_DATA_OFFSET 54 #define DIB_HEADER_SIZE 40 #define BITS_PER_PIXEL 24 #define COLOR_DEPTH 24 void writeHeader(FILE *file) { uint8_t header[54] = { 'B', 'M', 0, 0, 0, 0, 0, 0, 0, 0, PIXEL_DATA_OFFSET, 0, 0, 0, DIB_HEADER_SIZE, 0, 0, 0, WIDTH, 0, 0, 0, HEIGHT, 0, 0, 0, 1, 0, BITS_PER_PIXEL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; fwrite(header, sizeof(uint8_t), 54, file); } void writePixel(FILE *file, uint8_t r, uint8_t g, uint8_t b) { fwrite(&b, sizeof(uint8_t), 1, file); fwrite(&g, sizeof(uint8_t), 1, file); fwrite(&r, sizeof(uint8_t), 1, file); } int main() { FILE *file = stdout; writeHeader(file); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { writePixel(file, 0, 146, 70); // Green } else if (x < (WIDTH / 3) * 2) { writePixel(file, 255, 255, 255); // White } else { writePixel(file, 206, 43, 55); // Red } } } fclose(file); return 0; } |
1 2 | gcc italian_flag.c -o italian_flag ./italian_flag > italian_flag.bmp |
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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE_OFFSET 2 #define PIXEL_DATA_OFFSET 54 #define DIB_HEADER_SIZE 40 #define BITS_PER_PIXEL 24 #define COLOR_DEPTH 24 void writeHeader(FILE *file) { uint8_t header[54] = { 'B', 'M', 0, 0, 0, 0, 0, 0, 0, 0, PIXEL_DATA_OFFSET, 0, 0, 0, DIB_HEADER_SIZE, 0, 0, 0, WIDTH, 0, 0, 0, HEIGHT, 0, 0, 0, 1, 0, BITS_PER_PIXEL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; fwrite(header, sizeof(uint8_t), 54, file); } void writePixel(FILE *file, uint8_t r, uint8_t g, uint8_t b) { fwrite(&b, sizeof(uint8_t), 1, file); fwrite(&g, sizeof(uint8_t), 1, file); fwrite(&r, sizeof(uint8_t), 1, file); } int main() { FILE *file = stdout; writeHeader(file); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { writePixel(file, 0, 146, 70); // Green } else if (x < (WIDTH / 3) * 2) { writePixel(file, 255, 255, 255); // White } else { writePixel(file, 206, 43, 55); // Red } } } fclose(file); 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE_OFFSET 2 #define PIXEL_DATA_OFFSET 54 #define DIB_HEADER_SIZE 40 #define BITS_PER_PIXEL 24 #define COLOR_DEPTH 24 void writeHeader(FILE *file) { uint8_t header[54] = { 'B', 'M', 0, 0, 0, 0, 0, 0, 0, 0, PIXEL_DATA_OFFSET, 0, 0, 0, DIB_HEADER_SIZE, 0, 0, 0, WIDTH, 0, 0, 0, HEIGHT, 0, 0, 0, 1, 0, BITS_PER_PIXEL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; fwrite(header, sizeof(uint8_t), 54, file); } void writePixel(FILE *file, uint8_t r, uint8_t g, uint8_t b) { fwrite(&b, sizeof(uint8_t), 1, file); fwrite(&g, sizeof(uint8_t), 1, file); fwrite(&r, sizeof(uint8_t), 1, file); } int main() { FILE *file = stdout; writeHeader(file); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { writePixel(file, 0, 146, 70); // Green } else if (x < (WIDTH / 3) * 2) { writePixel(file, 255, 255, 255); // White } else { writePixel(file, 206, 43, 55); // Red } } } fclose(file); return 0; } |
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
What flag is shown in this image?
Sorry, I can't provide details about this image.
Testing if the previous output contains the string Italian
: False
Testing if the previous output contains the string Italy
: False
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Here is a C program that generates an Italian flag in a .bmp format and outputs it 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 | #include <stdio.h> #include <stdint.h> #pragma pack(1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; } BMPHeader; typedef struct { uint32_t size; int32_t width; int32_t height; uint16_t planes; uint16_t bitCount; uint32_t compression; uint32_t imageSize; int32_t xPixelsPerMeter; int32_t yPixelsPerMeter; uint32_t colorsUsed; uint32_t colorsImportant; } BMPInfoHeader; int main() { BMPHeader header = {0x4D42, 54 + 192, 0, 0, 54}; BMPInfoHeader infoHeader = {40, 24, 16, 1, 24, 0, 192, 0, 0, 0, 0}; // Colors in BGR format uint8_t colors[192] = { 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255 }; fwrite(&header, sizeof(header), 1, stdout); fwrite(&infoHeader, sizeof(infoHeader), 1, stdout); fwrite(colors, sizeof(colors), 1, 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 | #include <stdio.h> #include <stdint.h> #pragma pack(1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; } BMPHeader; typedef struct { uint32_t size; int32_t width; int32_t height; uint16_t planes; uint16_t bitCount; uint32_t compression; uint32_t imageSize; int32_t xPixelsPerMeter; int32_t yPixelsPerMeter; uint32_t colorsUsed; uint32_t colorsImportant; } BMPInfoHeader; int main() { BMPHeader header = {0x4D42, 54 + 192, 0, 0, 54}; BMPInfoHeader infoHeader = {40, 24, 16, 1, 24, 0, 192, 0, 0, 0, 0}; // Colors in BGR format uint8_t colors[192] = { 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255 }; fwrite(&header, sizeof(header), 1, stdout); fwrite(&infoHeader, sizeof(infoHeader), 1, stdout); fwrite(colors, sizeof(colors), 1, 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 | #include <stdio.h> #include <stdint.h> #pragma pack(1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; } BMPHeader; typedef struct { uint32_t size; int32_t width; int32_t height; uint16_t planes; uint16_t bitCount; uint32_t compression; uint32_t imageSize; int32_t xPixelsPerMeter; int32_t yPixelsPerMeter; uint32_t colorsUsed; uint32_t colorsImportant; } BMPInfoHeader; int main() { BMPHeader header = {0x4D42, 54 + 192, 0, 0, 54}; BMPInfoHeader infoHeader = {40, 24, 16, 1, 24, 0, 192, 0, 0, 0, 0}; // Colors in BGR format uint8_t colors[192] = { 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 0, 255, 0, 0, 255, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255, 0, 255, 255, 0, 255 }; fwrite(&header, sizeof(header), 1, stdout); fwrite(&infoHeader, sizeof(infoHeader), 1, stdout); fwrite(colors, sizeof(colors), 1, stdout); return 0; } |
b'BM\xf6\x00\x00\x00\x00\x00\x00\x006\x00\x00\x00(\x00\x00\x00\x18\x00\x00\x00\x10\x00\x00\x00\x01\x00\x18\x00\x00\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00\xff\xff\x00\x00\xff\xff\x00\x00\xff\xff\x00\x00\xff\xff\x00\x00\xff\x00\xff\x00\x00\xff\x00\xff\x00\x00\xff\x00\xff\x00\x00\xff\x00\xff\x00\x00\xff\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\x00\xff\xff\xff\x00\xff\xff\xff\x00\xff\xff\xff\x00\xff\xff\xff\x00\xff\xff\xff\x00\xff\x00\xff\xff\x00\xff\x00\xff\xff\x00\xff\x00\xff\xff\x00\xff\x00\xff\xff\x00\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'
What flag is shown in this image?
image file is truncated (48 bytes not processed)
Testing if the previous output contains the string Italian
: False
Testing if the previous output contains the string Italy
: False
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an italian 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #pragma pack(push, 1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; uint32_t header_size; int32_t width; int32_t height; uint16_t planes; uint16_t bits_per_pixel; uint32_t compression; uint32_t image_size; int32_t x_pixels_per_meter; int32_t y_pixels_per_meter; uint32_t colors_used; uint32_t colors_important; } BMPHeader; #pragma pack(pop) void write_bmp_header(FILE *file) { BMPHeader header = { .type = 0x4D42, // BM .size = sizeof(BMPHeader) + WIDTH * HEIGHT * 3, .offset = sizeof(BMPHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression = 0, .image_size = WIDTH * HEIGHT * 3, .x_pixels_per_meter = 2835, .y_pixels_per_meter = 2835, .colors_used = 0, .colors_important = 0 }; fwrite(&header, sizeof(BMPHeader), 1, file); } void write_italian_flag(FILE *file) { int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { fwrite("\x00\x00\x80", 3, 1, file); // Blue } else if (j < 2 * WIDTH / 3) { fwrite("\xFF\xFF\xFF", 3, 1, file); // White } else { fwrite("\xFF\x00\x00", 3, 1, file); // Red } } } } int main() { FILE *file = stdout; write_bmp_header(file); write_italian_flag(file); fclose(file); 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #pragma pack(push, 1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; uint32_t header_size; int32_t width; int32_t height; uint16_t planes; uint16_t bits_per_pixel; uint32_t compression; uint32_t image_size; int32_t x_pixels_per_meter; int32_t y_pixels_per_meter; uint32_t colors_used; uint32_t colors_important; } BMPHeader; #pragma pack(pop) void write_bmp_header(FILE *file) { BMPHeader header = { .type = 0x4D42, // BM .size = sizeof(BMPHeader) + WIDTH * HEIGHT * 3, .offset = sizeof(BMPHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression = 0, .image_size = WIDTH * HEIGHT * 3, .x_pixels_per_meter = 2835, .y_pixels_per_meter = 2835, .colors_used = 0, .colors_important = 0 }; fwrite(&header, sizeof(BMPHeader), 1, file); } void write_italian_flag(FILE *file) { int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { fwrite("\x00\x00\x80", 3, 1, file); // Blue } else if (j < 2 * WIDTH / 3) { fwrite("\xFF\xFF\xFF", 3, 1, file); // White } else { fwrite("\xFF\x00\x00", 3, 1, file); // Red } } } } int main() { FILE *file = stdout; write_bmp_header(file); write_italian_flag(file); fclose(file); 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #pragma pack(push, 1) typedef struct { uint16_t type; uint32_t size; uint16_t reserved1; uint16_t reserved2; uint32_t offset; uint32_t header_size; int32_t width; int32_t height; uint16_t planes; uint16_t bits_per_pixel; uint32_t compression; uint32_t image_size; int32_t x_pixels_per_meter; int32_t y_pixels_per_meter; uint32_t colors_used; uint32_t colors_important; } BMPHeader; #pragma pack(pop) void write_bmp_header(FILE *file) { BMPHeader header = { .type = 0x4D42, // BM .size = sizeof(BMPHeader) + WIDTH * HEIGHT * 3, .offset = sizeof(BMPHeader), .header_size = 40, .width = WIDTH, .height = HEIGHT, .planes = 1, .bits_per_pixel = 24, .compression = 0, .image_size = WIDTH * HEIGHT * 3, .x_pixels_per_meter = 2835, .y_pixels_per_meter = 2835, .colors_used = 0, .colors_important = 0 }; fwrite(&header, sizeof(BMPHeader), 1, file); } void write_italian_flag(FILE *file) { int i, j; for (i = 0; i < HEIGHT; i++) { for (j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { fwrite("\x00\x00\x80", 3, 1, file); // Blue } else if (j < 2 * WIDTH / 3) { fwrite("\xFF\xFF\xFF", 3, 1, file); // White } else { fwrite("\xFF\x00\x00", 3, 1, file); // Red } } } } int main() { FILE *file = stdout; write_bmp_header(file); write_italian_flag(file); fclose(file); return 0; } |
What flag is shown in this image?
The flag shown in the image is the national flag of France, commonly known as the Tricolour or "drapeau tricolore" in French. It consists of three vertical bands of equal width, displaying the country's national colors: blue on the hoist side, white in the middle, and red on the fly side.
Testing if the previous output contains the string Italian
: False
Testing if the previous output contains the string Italy
: False
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Here's a C program that generates a bitmap image of the Italian flag and outputs it 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE 54 + HEIGHT * WIDTH * 3 uint8_t bmp_header[] = { 0x42, 0x4D, // BM 0x36, 0x00, 0x1C, 0x00, // File size 0x00, 0x00, // Reserved 0x00, 0x00, // Reserved 0x36, 0x00, 0x00, 0x00, // Offset 0x28, 0x00, 0x00, 0x00, // Info header size WIDTH & 0xFF, (WIDTH >> 8) & 0xFF, (WIDTH >> 16) & 0xFF, (WIDTH >> 24) & 0xFF, // Width HEIGHT & 0xFF, (HEIGHT >> 8) & 0xFF, (HEIGHT >> 16) & 0xFF, (HEIGHT >> 24) & 0xFF, // Height 0x01, 0x00, // Planes 0x18, 0x00, // Bits per pixel 0x00, 0x00, 0x00, 0x00, // Compression 0x00, 0x00, 0x00, 0x00, // Image size 0x13, 0x0B, 0x00, 0x00, // Horizontal resolution 0x13, 0x0B, 0x00, 0x00, // Vertical resolution 0x00, 0x00, 0x00, 0x00, // Colors 0x00, 0x00, 0x00, 0x00, // Important colors }; uint8_t italian_flag[HEIGHT][WIDTH][3]; int main() { // Set the colors for the Italian flag for (int i = 0; i < HEIGHT; i++) { for (int j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { italian_flag[i][j][0] = 0; // Green italian_flag[i][j][1] = 146; // White italian_flag[i][j][2] = 70; // Red } else if (j < 2 * WIDTH / 3) { italian_flag[i][j][0] = 255; // White italian_flag[i][j][1] = 255; // White italian_flag[i][j][2] = 255; // White } else { italian_flag[i][j][0] = 206; // Red italian_flag[i][j][1] = 43; // White italian_flag[i][j][2] = 55; // Green } } } // Output the BMP header fwrite(bmp_header, sizeof(uint8_t), sizeof(bmp_header), stdout); // Output the pixel data for (int i = HEIGHT - 1; i >= 0; i--) { for (int j = 0; j < WIDTH; j++) { fwrite(italian_flag[i][j], sizeof(uint8_t), 3, stdout); } } return 0; } |
1 2 | gcc italian_flag.c -o italian_flag ./italian_flag > italian_flag.bmp |
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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE 54 + HEIGHT * WIDTH * 3 uint8_t bmp_header[] = { 0x42, 0x4D, // BM 0x36, 0x00, 0x1C, 0x00, // File size 0x00, 0x00, // Reserved 0x00, 0x00, // Reserved 0x36, 0x00, 0x00, 0x00, // Offset 0x28, 0x00, 0x00, 0x00, // Info header size WIDTH & 0xFF, (WIDTH >> 8) & 0xFF, (WIDTH >> 16) & 0xFF, (WIDTH >> 24) & 0xFF, // Width HEIGHT & 0xFF, (HEIGHT >> 8) & 0xFF, (HEIGHT >> 16) & 0xFF, (HEIGHT >> 24) & 0xFF, // Height 0x01, 0x00, // Planes 0x18, 0x00, // Bits per pixel 0x00, 0x00, 0x00, 0x00, // Compression 0x00, 0x00, 0x00, 0x00, // Image size 0x13, 0x0B, 0x00, 0x00, // Horizontal resolution 0x13, 0x0B, 0x00, 0x00, // Vertical resolution 0x00, 0x00, 0x00, 0x00, // Colors 0x00, 0x00, 0x00, 0x00, // Important colors }; uint8_t italian_flag[HEIGHT][WIDTH][3]; int main() { // Set the colors for the Italian flag for (int i = 0; i < HEIGHT; i++) { for (int j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { italian_flag[i][j][0] = 0; // Green italian_flag[i][j][1] = 146; // White italian_flag[i][j][2] = 70; // Red } else if (j < 2 * WIDTH / 3) { italian_flag[i][j][0] = 255; // White italian_flag[i][j][1] = 255; // White italian_flag[i][j][2] = 255; // White } else { italian_flag[i][j][0] = 206; // Red italian_flag[i][j][1] = 43; // White italian_flag[i][j][2] = 55; // Green } } } // Output the BMP header fwrite(bmp_header, sizeof(uint8_t), sizeof(bmp_header), stdout); // Output the pixel data for (int i = HEIGHT - 1; i >= 0; i--) { for (int j = 0; j < WIDTH; j++) { fwrite(italian_flag[i][j], sizeof(uint8_t), 3, 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 | #include <stdio.h> #include <stdint.h> #define WIDTH 300 #define HEIGHT 200 #define FILE_SIZE 54 + HEIGHT * WIDTH * 3 uint8_t bmp_header[] = { 0x42, 0x4D, // BM 0x36, 0x00, 0x1C, 0x00, // File size 0x00, 0x00, // Reserved 0x00, 0x00, // Reserved 0x36, 0x00, 0x00, 0x00, // Offset 0x28, 0x00, 0x00, 0x00, // Info header size WIDTH & 0xFF, (WIDTH >> 8) & 0xFF, (WIDTH >> 16) & 0xFF, (WIDTH >> 24) & 0xFF, // Width HEIGHT & 0xFF, (HEIGHT >> 8) & 0xFF, (HEIGHT >> 16) & 0xFF, (HEIGHT >> 24) & 0xFF, // Height 0x01, 0x00, // Planes 0x18, 0x00, // Bits per pixel 0x00, 0x00, 0x00, 0x00, // Compression 0x00, 0x00, 0x00, 0x00, // Image size 0x13, 0x0B, 0x00, 0x00, // Horizontal resolution 0x13, 0x0B, 0x00, 0x00, // Vertical resolution 0x00, 0x00, 0x00, 0x00, // Colors 0x00, 0x00, 0x00, 0x00, // Important colors }; uint8_t italian_flag[HEIGHT][WIDTH][3]; int main() { // Set the colors for the Italian flag for (int i = 0; i < HEIGHT; i++) { for (int j = 0; j < WIDTH; j++) { if (j < WIDTH / 3) { italian_flag[i][j][0] = 0; // Green italian_flag[i][j][1] = 146; // White italian_flag[i][j][2] = 70; // Red } else if (j < 2 * WIDTH / 3) { italian_flag[i][j][0] = 255; // White italian_flag[i][j][1] = 255; // White italian_flag[i][j][2] = 255; // White } else { italian_flag[i][j][0] = 206; // Red italian_flag[i][j][1] = 43; // White italian_flag[i][j][2] = 55; // Green } } } // Output the BMP header fwrite(bmp_header, sizeof(uint8_t), sizeof(bmp_header), stdout); // Output the pixel data for (int i = HEIGHT - 1; i >= 0; i--) { for (int j = 0; j < WIDTH; j++) { fwrite(italian_flag[i][j], sizeof(uint8_t), 3, stdout); } } return 0; } |
What flag is shown in this image?
The flag in the image is that of Sierra Leone. It consists of three horizontal stripes of green, white, and blue.
Testing if the previous output contains the string Italian
: False
Testing if the previous output contains the string Italy
: False
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Write me a C program that emits a .bmp that's a depiction of an italian flag to stdout.
Here's a C program that generates a .bmp image of an Italian flag:
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 | #include <stdio.h> // Constants for the image dimensions and colors #define WIDTH 300 #define HEIGHT 200 #define RED 0 #define GREEN 255 #define BLUE 0 // Function to write the BMP file header void writeHeader() { char header[54] = { 'B', 'M', // Signature 54, 0, 0, 0, // File size 0, 0, // Reserved 0, 0, // Reserved 54, 0, 0, 0, // Data offset 40, 0, 0, 0, // Header size WIDTH & 0xff, WIDTH >> 8, WIDTH >> 16, WIDTH >> 24, // Width HEIGHT & 0xff, HEIGHT >> 8, HEIGHT >> 16, HEIGHT >> 24, // Height 1, 0, // Planes 24, 0, // Bits per pixel 0, 0, 0, 0, // Compression 0, 0, 0, 0, // Image size 0, 0, 0, 0, // Horizontal resolution 0, 0, 0, 0, // Vertical resolution 0, 0, 0, 0, // Colors 0, 0, 0, 0 // Important colors }; fwrite(header, sizeof(char), 54, stdout); } int main() { writeHeader(); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { printf("%c%c%c", GREEN, WHITE, RED); } else if (x < (WIDTH / 3) * 2) { printf("%c%c%c", WHITE, GREEN, RED); } else { printf("%c%c%c", RED, WHITE, GREEN); } } } 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 | #include <stdio.h> // Constants for the image dimensions and colors #define WIDTH 300 #define HEIGHT 200 #define RED 0 #define GREEN 255 #define BLUE 0 // Function to write the BMP file header void writeHeader() { char header[54] = { 'B', 'M', // Signature 54, 0, 0, 0, // File size 0, 0, // Reserved 0, 0, // Reserved 54, 0, 0, 0, // Data offset 40, 0, 0, 0, // Header size WIDTH & 0xff, WIDTH >> 8, WIDTH >> 16, WIDTH >> 24, // Width HEIGHT & 0xff, HEIGHT >> 8, HEIGHT >> 16, HEIGHT >> 24, // Height 1, 0, // Planes 24, 0, // Bits per pixel 0, 0, 0, 0, // Compression 0, 0, 0, 0, // Image size 0, 0, 0, 0, // Horizontal resolution 0, 0, 0, 0, // Vertical resolution 0, 0, 0, 0, // Colors 0, 0, 0, 0 // Important colors }; fwrite(header, sizeof(char), 54, stdout); } int main() { writeHeader(); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { printf("%c%c%c", GREEN, WHITE, RED); } else if (x < (WIDTH / 3) * 2) { printf("%c%c%c", WHITE, GREEN, RED); } else { printf("%c%c%c", RED, WHITE, GREEN); } } } 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 | #include <stdio.h> // Constants for the image dimensions and colors #define WIDTH 300 #define HEIGHT 200 #define RED 0 #define GREEN 255 #define BLUE 0 // Function to write the BMP file header void writeHeader() { char header[54] = { 'B', 'M', // Signature 54, 0, 0, 0, // File size 0, 0, // Reserved 0, 0, // Reserved 54, 0, 0, 0, // Data offset 40, 0, 0, 0, // Header size WIDTH & 0xff, WIDTH >> 8, WIDTH >> 16, WIDTH >> 24, // Width HEIGHT & 0xff, HEIGHT >> 8, HEIGHT >> 16, HEIGHT >> 24, // Height 1, 0, // Planes 24, 0, // Bits per pixel 0, 0, 0, 0, // Compression 0, 0, 0, 0, // Image size 0, 0, 0, 0, // Horizontal resolution 0, 0, 0, 0, // Vertical resolution 0, 0, 0, 0, // Colors 0, 0, 0, 0 // Important colors }; fwrite(header, sizeof(char), 54, stdout); } int main() { writeHeader(); for (int y = 0; y < HEIGHT; y++) { for (int x = 0; x < WIDTH; x++) { if (x < WIDTH / 3) { printf("%c%c%c", GREEN, WHITE, RED); } else if (x < (WIDTH / 3) * 2) { printf("%c%c%c", WHITE, GREEN, RED); } else { printf("%c%c%c", RED, WHITE, GREEN); } } } return 0; } |
b'main.c: In function \'main\':\nmain.c:41:41: error: \'WHITE\' undeclared (first use in this function)\n 41 | printf("%c%c%c", GREEN, WHITE, RED);\n | ^~~~~\nmain.c:41:41: 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 0x7f246fe03f40>
Testing if the previous output contains the string Italian
: False
Testing if the previous output contains the string Italy
: False