Having trouble converting a decimal into a binary in C. No output

Question

Normally this would be easy, but I just started learning C. I'm using visual studio 2017 community and right now I don't seem to be able to use watches. When I run the program it outputs nothing. What did I do wrong?

//20_10_17
//Crehul Vlad
//Base conversion: Decimal into Binary
#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

void main() {
    int k=0, i, r, nr, c, N[64];
    printf("Decimal Nr: "); scanf("%d", &nr);
    c = nr;
    while (nr % 2 != 0) {
        r = c % 2;
        c = c / 2;
        N[k] = r; k++;
    }
    for (i = k; i > 0; i--) {
        printf("%d ", N[i]);
    }

_getch();
return 0;
}

Answer 1

int main()
{
    int k=0, i, r, nr, c, N[64];
    printf("Decimal Nr: "); scanf("%d", &nr);
    c = nr;
    if(nr==0)
      printf("0");
    else{
    while (nr) {
        r = nr % 2;
        nr = nr / 2;
        N[k] = r; k++;
      }
    }
    // original number in variable c
    for (i = k-1; i >= 0; i--) {
        printf("%d ", N[i]);
    }
    return 0;
}

Just try to understand what the algorithm does. And be careful when you code terminating conditions.