Coding Challange 6 - CPP

#include <stdio.h>
#include <stdbool.h>

int main()
{
    while (true)
    {
        unsigned long long zahl = 0;
        unsigned long long rev = 0;

        printf("Enter number:");
        scanf_s("%lld", &zahl);

        while (zahl > 0) {
            rev <<= 1;

            if ((zahl & 1) == 1) {
                rev ^= 1;
            }

            zahl >>= 1;
        }

        while (rev > 0)
        {
            printf("%d", ((rev & 1) == 1) ? 1 : 0);
            rev >>= 1;
        }

        printf("\n");
    }

    return 0;
}