稍微笨法子:也可以添加哨兵在判断ab大小的时候

#include using namespace std;

int main() {

// write your code here......
int a,b;
scanf("%d%d",&a,&b);

    if(a>b)
    {  //s=a;
		//a=b;
		//b=s;
		//就可以把最后一条else语句中的所有内容去掉了 两种法子
        printf("%d" " ",a+b);
        printf("%d" " ",a-b);
        printf("%d" " ",a*b);
        printf("%d" " ",a/b);
        printf("%d" " ",a%b);
        
    }
    else{
        printf("%d" " ",b+a);
        printf("%d" " ",b-a);
        printf("%d" " ",b*a);
         printf("%d" " ",b/a);
         printf("%d" " ",b%a);
    }

return 0;

}