目录
按值传递和按引用传递区别
指针，引用传递程序示例
程序理解
按值传递和按引用传递区别
指针，引用传递程序示例
// swaps.cpp -- 使用指针和引用来进行交换
#include<iostream>
void swapr(int & a, int & b);
void swapp(int * p, int * q);
void swapv(int a, int b);
int main()
{
using namespace std;
int wallet1 = 300;
int wallet2 = 350;
cout << "--------------------" << endl;
cout << "wallet1 = $" << wallet1;
cout << "wallet2 = $" << wallet2 << endl << endl;
cout << "--------------------" << endl;
cout << "Using references to swap contents: \n";
swapr(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout << "wallet2 = $" << wallet2 << endl << endl;
cout << "--------------------" << endl;
cout << "Using pointer to swap contents again:\n";
swapp(&wallet1, &wallet2);
cout << "wallet1 = $" << wallet1;
cout << "wallet2 = $" << wallet2 << endl << endl;
cout << "--------------------" << endl;
cout << "Trying to use passing by value：\n";
swapv(wallet1, wallet2);
cout << "wallet1 = $" << wallet1;
cout << "wallet2 = $" << wallet2 << endl << endl;
return 0;
}
void swapr(int & a, int & b)//使用引用
{
int temp;
temp = a;
a = b;
b = temp;
}
void swapp(int * p, int * q)
{
int temp;
temp = *p;
*p = *q;
*q = temp;
}
void swapv(int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
程序理解
按引用传递swapr(wallet1, wallet2)和按值传递swapv(wallet1, wallet2)看起来相同，只有通过原型才知道是按值传递还是按引用传递
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