Third practice 1

任务描述

分别使用传值、引用、指针参数，以及模板函数实现Swap( x， y )，函数功能为交换x、y的值。

测试输入：3，4，2.2，3.3；

预期输出：

j = 3 k=4

v = 2.2 w=3.3

After swap:

j = 4 k = 3

v = 3.3 w = 2.2

源代码

#include <iostream>
using namespace std;

template <typename  T>
void Swap(T &x, T &y)
{
    T z;
    z = x;
    x = y;
    y = z;
}
int main()
{
    float j,k,v,w;
    cin>>j>>k>>v>>w;
    cout<<"j = "<<j<<" k = "<<k<<endl;
    cout<<"v = "<<v<<" w = "<<w<<endl;

    Swap(j,k);
    Swap(v,w);

    cout<<"After swap:"<<endl;
    cout<<"j = "<<j<<" k = "<<k<<endl;
    cout<<"v = "<<v<<" w = "<<w;
    return 0;
}