#include<iostream>
#include<string>
using namespace std;//1、值传递
void mySwap01(int a, int b) {int temp = a;a = b;b = temp;cout << "mySwap01 a=" << a << endl;cout << "mySwap01 b=" << b << endl;}//2、地址传递
void mySwap02(int * a, int * b) {int temp = *a;*a = *b;*b = temp;cout << "mySwap01 a=" << *a << endl;cout << "mySwap01 b=" << *b << endl;}//3、引用传递
void mySwap03(int &a,int &b) {int temp = a;a = b;b = temp;cout << "mySwap03 a=" << a << endl;cout << "mySwap03 b=" << b << endl;
}int main() {int a = 10;int b = 20;mySwap01(a,b);  //值传递，形参不会修饰实参//  mySwap02(&a, &b);//  mySwap03(a, b);cout << "a="<<a<<endl;cout << "b="<<b<<endl;system("pause" ) ;}

值传递实参不会改变 

地址传递会改变实参的值 

 引用传递