Copies the binary representation of an integer to a string

intncpy.c

#include <string.h>
#include <stdio.h>

#define INT_BITS_NUM (8 * sizeof(int))

void intncpy(int src, char *dest, int len)
{
    int bit = INT_BITS_NUM - 1;
    int pos, is_set;

    for (pos = 0; pos < len; pos++) {
        is_set = src & (1 << bit);

        if (is_set) {
            dest[pos] = '1';
        } else {
            dest[pos] = '0';
        }

        bit--;
    }
}

int main(int argc, char *argv[])
{
    char a[INT_BITS_NUM + 1];
    int i;

    for (i = 0; i <= 31; i++) {
        intncpy(1 << i, a, INT_BITS_NUM);
        a[INT_BITS_NUM] = '\0';
        printf("%s\n", a);
        memset(a, '\0', INT_BITS_NUM);
    }

    return 0;
}