Integer to Binary

#include<stdio.h>

int main()
{
    int n;
    scanf("%d", &n);

    int ar[11111];
    int idx=0;
    int rem;
    while(1){
        if(n==0) break;
        rem=n%2;
        ar[idx]=rem;
        idx++;
        n=n/2;
    }

    for(int i=idx-1;i>=0;i--){
        printf("%d", ar[i]);
    }
    printf("\n");

    return 0;

}