十进制转二进制 C语言实现

#include <stdio.h>#include <stdio.h>int main(void){    int num = 123;    int i = 0;    int arr[30] = {0x00};    while(num != 0)    {        arr[i++] = num%2;        num = num/2;    }    for(i = 0;i < 15;++i)    {        printf ("%d",arr[i]);    }    return 0;}

注：数组arr中倒序显示一下才是正确的结果