（C++）值传递，地址传递，引用传递

#include <iostream>
using namespace std;

//值传递
void Swap1(int a,int b) {
	int temp = a;
	a = b;
	b = a;
}

//地址传递
void Swap2(int* a, int* b) {
	int temp = *a;
	*a = *b;
	*b = temp;
}

//引用传递
void Swap3(int& a, int& b) {
	int temp = a;
	a = b;
	b = temp;
}
void main() {

	int a = 10;
	int b = 20;

	cout << "值传递______________" << endl;

	Swap1(a, b);
	
	cout << "a=" << a<<endl;
	cout << "b=" << b<<endl;

	cout << "地址传递______________" << endl;

	Swap2(&a, &b);

	cout << "a=" << a << endl;
	cout << "b=" << b << endl;

	cout << "引用传递______________" << endl;

	Swap3(a, b);

	cout << "a=" << a << endl;
	cout << "b=" << b << endl;

	cout << "______________" << endl;
}