指针和引用

指针 *
引用 &
如下代码显示两者不同：

#include "stdafx.h"
#include<iostream>
using namespace std;

void swapr(int & a, int & b);
void swapp(int * p, int * q);
void swapv(int a, int b);

int _tmain(int argc, _TCHAR* argv[])
{
    int wallet1 = 300;
    int wallet2 = 350;
    cout << wallet1 << endl;
    cout << wallet2 << endl;
    cout << endl;

    swapr(wallet1, wallet2);
    cout << wallet1 << endl;
    cout << wallet2 << endl;
    cout << endl;

    swapp(& wallet1, & wallet2);
    cout << wallet1 << endl;
    cout << wallet2 << endl;
    cout << endl;

    swapv(wallet1, wallet2);
    cout << wallet1 << endl;
    cout << wallet2 << endl;

    return 0;
}

void swapr(int & a, int & b)
{
    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;
}