C++：别名 / 引用 的简单实用

文章来源:http://www.cnblogs.com/hello-tl/p/7910048.html 

/*
    C++别名操作

    在更改别名的时候同时变量也会跟着改变
*/
#include "stdafx.h"

#include <stdlib.h>;

#include <iostream>;
using namespace std;

typedef struct
{
    int x;
    int y;
}Coord;

// 例子1
void test1(){
    Coord C;
    Coord &C1 = C;

    C1.x = 10;
    C1.y = 20;

    cout << "例子1   " << "x=" << C1.x << "   " << "y=" << C.y << endl;
}

// 例子2
void test2(){
    int x = 10;
    int &y = x;
    y = 20;
    cout << "例子2   " << "x=" << x << endl;
}

//例子3
void test3(){
    int a = 10;

    int *p = &a;

    int *&q= p;

    *q = 20;

    cout << "例子3   " << "a=" << a << endl;
}

//例子4
void test4(int &x,int &y){
    int n = 0;
    n = x;
    x = y;
    y = n;
}

int main(void)
{
    
    //调用例子1
    test1();

    //调用例子2
    test2();

    //调用例子3
    test3();

    //调用例子4
    int x = 10;
    int y = 20;
    cout << "-------------------------------------------" << endl;
    cout << "------例子四调用前---------------------------" << endl;

    cout << "x=" << x << "    " << "y=" << y << endl;
    test4(x,y);

    cout << "------例子四调用后---------------------------" << endl;

    cout << "x=" << x << "    " << "y=" << y << endl;

    cout << "-------------------------------------------" << endl;


    system("pause");

    return 0;

}

文章来源:http://www.cnblogs.com/hello-tl/p/7910048.html