C面试题：10进制转2进制

10进制转2进制：移位+‘与’运算

 
#include <stdio.h>
#include <stdlib.h>
#define MAXSIZE 8
int main()
{
    unsigned int flags, num, tmp=0x80;//对应1,000,000
    unsigned result;
    printf("\tEnter an number, please:");
    scanf("%d",&num);
    printf("\n\t");

    for(flags=1;flags<=MAXSIZE;flags++)
    {
        tmp=0x80;
        tmp=tmp>>(flags-1);//移位
        result=tmp&num;//与
        result=result>>(MAXSIZE-flags);
        printf("%d",result);
    }
   return 0;
}
//运行结果
 

#待完善！