Initial Query

Code golf this function to be a lot shorter. You only get points if it's <200 bytes (not counting whitespace). Keep the name `stepper`. 

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void stepper(int xw) {
  int Steps = 0;
  for (int x = 0; x < xw; x++) {
    switch (Steps) {
      case 0:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 1);
        break;
      case 1:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 1);
        digitalWrite(4, 1);
        break;
      case 2:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 1);
        digitalWrite(4, 0);
        break;
      case 3:
        digitalWrite(1, 0);
        digitalWrite(2, 1);
        digitalWrite(3, 1);
        digitalWrite(4, 0);
        break;
      case 4:
        digitalWrite(1, 0);
        digitalWrite(2, 1);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 5:
        digitalWrite(1, 1);
        digitalWrite(2, 1);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 6:
        digitalWrite(1, 1);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 7:
        digitalWrite(1, 1);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 1);
        break;
      default:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
    }
    Steps = (Steps + 1) % 8;
  }
}

LLM Generation

Query

Code golf this function to be a lot shorter. You only get points if it's <200 bytes (not counting whitespace). Keep the name `stepper`. 

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void stepper(int xw) {
  int Steps = 0;
  for (int x = 0; x < xw; x++) {
    switch (Steps) {
      case 0:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 1);
        break;
      case 1:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 1);
        digitalWrite(4, 1);
        break;
      case 2:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 1);
        digitalWrite(4, 0);
        break;
      case 3:
        digitalWrite(1, 0);
        digitalWrite(2, 1);
        digitalWrite(3, 1);
        digitalWrite(4, 0);
        break;
      case 4:
        digitalWrite(1, 0);
        digitalWrite(2, 1);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 5:
        digitalWrite(1, 1);
        digitalWrite(2, 1);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 6:
        digitalWrite(1, 1);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
      case 7:
        digitalWrite(1, 1);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 1);
        break;
      default:
        digitalWrite(1, 0);
        digitalWrite(2, 0);
        digitalWrite(3, 0);
        digitalWrite(4, 0);
        break;
    }
    Steps = (Steps + 1) % 8;
  }
}

Output

Okay, let's golf this! The original code steps through a sequence of 8 states, setting 4 digital pins in each state. This pattern can be encoded into an array. **Analysis:** 1. **Pattern:** The sequence of pin states (Pin1, Pin2, Pin3, Pin4) is: * 0: 0001 (Decimal 1) * 1: 0011 (Decimal 3) * 2: 0010 (Decimal 2) * 3: 0110 (Decimal 6) * 4: 0100 (Decimal 4) * 5: 1100 (Decimal 12) * 6: 1000 (Decimal 8) * 7: 1001 (Decimal 9) 2. **Loop:** The outer loop runs `xw` times. 3. **State:** The `Steps` variable cycles 0-7. 4. **Output:** Four `digitalWrite` calls per step. **Golfing Strategy:** 1. Store the patterns in an array. 2. Use a loop for the steps (`xw`). 3. Use the loop counter modulo 8 (or a separate counter) to index the pattern array. 4. Use bitwise operations to extract the state for each pin from the pattern. 5. Use a nested loop (1 to 4) for the `digitalWrite` calls. 6. Shorten variable names and use compact loop structures. **Golfed Code:** 

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void stepper(int w){int p[]={1,3,2,6,4,12,8,9},s=0,i;while(w--){for(i=0;i<4;)digitalWrite(++i,p[s]>>(3-i)&1);s=++s&7;}}
**Explanation:** 1. `void stepper(int w)`: Function definition (renamed `xw` to `w` for brevity). 2. `int p[]={1,3,2,6,4,12,8,9}`: Array storing the 8 patterns (Pin1=MSB, Pin4=LSB). 3. `s=0,i;`: Initializes step counter `s` and declares loop variable `i`. 4. `while(w--)`: Outer loop runs `w` (formerly `xw`) times, decrementing `w` until it's zero. 5. `for(i=0;i<4;)`: Inner loop iterates 4 times for the 4 pins. Note the increment `++i` is inside the loop body. 6. `digitalWrite(++i, p[s]>>(3-i)&1);`: * `++i`: Increments `i` *before* use, so it goes 1, 2, 3, 4 (the pin numbers). * `p[s]`: Gets the current pattern from the array using state `s`. * `(3-i)`: Calculates the bit position (0 for pin 4, 1 for pin 3, 2 for pin 2, 3 for pin 1). This is slightly shorter than `4-i` because `i` is pre-incremented. * `>>`: Right-shifts the pattern to bring the desired bit to the LSB position. * `&1`: Masks the result to get just the LSB (0 or 1). * `digitalWrite(...)`: Writes the calculated value (0 or 1) to the pin (`i`). 7. `s=++s&7;`: Increments the step counter `s` and wraps it around using bitwise AND with 7 (which is equivalent to modulo 8). **Byte Count (excluding whitespace):** 
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voidstepper(intw){intp[]={1,3,2,6,4,12,8,9},s=0,i;while(w--){for(i=0;i<4;)digitalWrite(++i,p[s]>>(3-i)&1);s=++s&7;}}
Counting characters: `voidstepper(intw){` = 19 `intp[]={1,3,2,6,4,12,8,9},s=0,i;` = 30 `while(w--){` = 10 `for(i=0;i<4;)` = 13 `digitalWrite(++i,p[s]>>(3-i)&1);` = 31 `s=++s&7;` = 8 `}}` = 2 Total: 19 + 30 + 10 + 13 + 31 + 8 + 2 = **113 bytes**. This is well under the 200-byte limit.

Extract Code

I extracted the following code from that output: 

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#include <Arduino.h> // Assuming digitalWrite is from Arduino environment

void stepper(int w){int p[]={1,3,2,6,4,12,8,9},s=0,i;while(w--){for(i=0;i<4;)digitalWrite(++i,p[s]>>(3-i)&1);s=++s&7;}}

Check if all of the following conditions are true:

Run Code Interpreter

Running the following program: 

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#include <Arduino.h> // Assuming digitalWrite is from Arduino environment

void stepper(int w){int p[]={1,3,2,6,4,12,8,9},s=0,i;while(w--){for(i=0;i<4;)digitalWrite(++i,p[s]>>(3-i)&1);s=++s&7;}}



#include<stdio.h>
#include<stdlib.h>

#include <stdio.h>

int out = 0;
int digitalWrite(int pin, int value) {
  out *= 101;
  out += pin;
  out *= 97;
  out += value;
  return out;
}

int main() {


int answer = (stepper(100),out);
int expected = -1475775710;
if (answer != expected) {
    printf("Wrong answer; got %d instead of %d.\n", answer, expected);
    exit(1);
}
printf("All tests passed\n");
}
And got the output: main.c:2:10: fatal error: Arduino.h: No such file or directory 2 | #include <Arduino.h> // Assuming digitalWrite is from Arduino environment | ^~~~~~~~~~~ compilation terminated. main.sh: line 2: ./a.out: No such file or directory

Substring Evaluation

Testing if the previous output contains the string All tests passed: False

PyFunc

Resulting in output: True

Final Answer: False