C语言巧妙运用位运算十进制转化为二进制输出

巧妙运用位运算十进制转化为二进制输出,正数负数都适合

代码：

#include
#include 
#include 
int main()
{
    int numb;
    char *buff = (char*)malloc(10*sizeof(char));
    int count = 0;
    scanf("%d",&numb);
    count = 0;
    int index = 0;
    do{
        buff[count++] = numb&1;
        numb = numb >> 1;
        if(numb == 0){
            break;
        }
        index ++;
    }while(index < 32);
    for(count--;count >= 0; count--){
        printf("%d",buff[count]);
    }
    free(buff);
    return 0;
}

输出结果
输入-2

-2
11111111111111111111111111111110

输入15

17
10001