Problem G: 十进制数转换为二进制数

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