短除法

#include<stdio.h>
int main()
{
    int n;
    while(scanf("%d",&n)!=EOF){
        if(n==0){
            printf("0\n");
            continue;
        }int a[1001],num=0;
        while(n>0){
            a[num]=n%2;
            n=n/2;
            num++;
        }for(int i=num-1;i>=0;i--){
            printf("%d",a[i]);
        }printf("\n");
    }
    return 0;
}