swap函数

#include<iostream>
using namespace std;
void swap(int& a,int& b){
    int t=a;
    a=b;
    b=t;
}
int main(){
    int a,b;
    while(cin>>a>>b){
        swap(a,b);
        cout<<a<<b<<endl;
    }
    return 0;
}

转载于:https://www.cnblogs.com/mch5201314/p/9391691.html