十进制函数转化二进制

#include <stdio.h>

int main(void)
{
    int result[100];
    int num, i = 0, j;

    printf("Please enter a number :\n");
    scanf("%d", &num);

    while(num) {
        result[i++] = num % 2;
        num = num / 2;
    }   

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

    return 0;
}