// print bits from an integer one per line, reverse order

#include <stdio.h>

#define MAXBITS 32

int main(int argc, char *argv[]) {
    int num;
    unsigned int rem;
    int bits[MAXBITS];
    int nbits;

    while (1) {  // forever
        // get the number
        printf("Integer? ");
        if (scanf("%d", &num) != 1) break;

        // extract the digits
        rem = num;
        nbits = 0;
        do {
            bits[nbits] = rem % 2;
            nbits++;
            rem = rem / 2;
        } while (rem != 0);

        printf("%d = %08x = ", num, num);
        for (int i = nbits-1; i >= 0; i--) {
            printf("%d", bits[i]);
        }
        putchar('\n');
    }
    return 0;
}