C++学习：使用引用和指针修改实参的值_分别使用引用和指针的方法, 实现在一个函数中修改实参的值

参考：面向对象程序设计及C++，P24

// excise_20230807d.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
 
#include <iostream>
using namespace std;
void swapY(int &x, int &y)		//交换,使用引用方式
{
	int t = x;
	x = y;
	y = t;
}
void swapP(int* x, int* y)		//交换,使用指针方式
{
	int t = *x;
	*x = *y;
	*y = t;
}
 
int main()
{
	int a = 3, b = 5, c = 10, d = 20;
	cout << "a = " << a
		<< " b = " << b << endl;
	swapY(a, b);		//相当于执行了int &x=a, &y = b
	cout<< "a = " << a
		<< " b =" << b << endl;
 
	cout<< "c = " << c
		<< " d = " << d << endl;
	swapP(&c, &d);     
	cout << "c = " << c
		<< " d = " << d << endl;
 
	std::cout << "Hello World!\n";
	getchar();
}
 

运行结果：