文章标题

#include <iostream>
using namespace std;
void change (int &a, int &b);
void main()
{
int a = 5;
int &b = a; //用&表示申明一个引用，引用必须在申明时进行初始化,引用一旦初始化，它就代表一块特定的内存，再也不能代表其他的内存。
int c = 3;
b = c;
cout << "a is" << a << endl << "b is" << b << endl << "c is" << c << endl;
int x = 5;
int y = 3;
cout << "original X=" << x << endl;
cout << "original Y=" << y << endl;

change(x, y);

cout << "changed X=" << x << endl;
cout << "changed Y=" << y << endl;
cin.get();
}
void change(int &a, int &b)
{
a = a + b;  //a、b地址总和赋值给a
b = a - b;
a = a - b;
}