#include <stdio.h>

const char HEXDIGITS[18] = "0123456789abcdef";
const char BINARYDIGITS[4] = "01";

int main() {
    int n0, n, i, res;
    char hex[32];
    char binary[128];
    while (true) {
        printf("Input a number:\n");
        res = scanf("%d", &n0);
        if (res <= 0 || n0 == 0)
            break;

        // Hex representation
        n = n0;
        i = sizeof(int)*2;
        hex[i] = 0;
        while(i > 0) {
            --i;
            int d = (n & 0xf);
            n >>= 4;
            hex[i] = HEXDIGITS[d];
        }
        printf("Hex representation: %s\n", hex);

        // Binary representation
        n = n0;
        i = sizeof(int)*8;
        binary[i] = 0;
        while(i > 0) {
            --i;
            int d = (n & 1);
            n >>= 1;
            binary[i] = BINARYDIGITS[d];
        }
        printf("Binary representation: %s\n", binary);
    }
    return 0;
}