Stack练习:: 十进制正整数转化成二进制

include "stdio.h"
int main(void)
{
    int n,num,value=0,i=0,j;
    /*输入一个十进制数*/
    scanf("%d",&num);
    n=num;
    /*十进制转二进制*/
    while(n)
    {
      n=n/2;
      i++;
    }
    while(num)
    {
       value=num%2;
       for(j=1;j<i;j++)
          printf(" ");
       printf("%d",value);
       printf("\r");
       num=num/2;
       i--;
    }
    return 0;
}

十进制转十六进制