bin2.c

#include <stdio.h>
#include <stdint.h>

typedef uint8_t u8;

int getBinary(u8 n, int bits, char *output) {
    for(int i = 0; i < bits; i++) {
        int bit = (n >> (bits - 1 - i)) & 0x01;
        output[i] = bit ? '1' : '0';
    }
    output[bits] = '\0';
    return 0;
}

int setBinary(u8 n, int length, char * cReturn)
{
    int i = 0;
    u8 val = n;
    if (cReturn == NULL)
        return -1;

    for (i = 0; i < length; i++)
    {
        if ((val & 0x1) == 1)
        {
            cReturn[length - i - 1] = '1';
        }
        else
        {
            cReturn[length - i - 1] = '0';
        }
        val >>= 1;
    }

    cReturn[length] = '\0';
    return 0;
}


int main() {
    char bin[9];
    //getBinary(5, 8, bin);
    //printf("Binary = %s\n", bin);  // Output: 00000101
    setBinary(13, 8, bin);
    printf("Binary = %s\n", bin);  // Output: 00000101
    return 0;
}