C++引用与传参

# include <iostream>
using namespace std;

void Swap(int *pa, int *pb)  
{
    int t = *pa;
    *pa = *pb;
    *pb = t;
    cout << "*pa = " << *pa << endl;
    
}

void Swap(int &a, int &b) {
    int tmp;
    tmp = a;
    a = b;
    b = tmp;
    
    cout << "tmp = " << tmp << endl;  

}

int main()
{
    int a = 3, b = 5;
    
    Swap(&a, &b);   /*执行第一个*/
    Swap(a, b);   /*执行第二个*/
    printf("a = %d""; b = %d\n", a, b);
    cout << "a = " << a << "; b = " << b << endl;
    return 0;
}

输出结果