C++离港篇

4.0 C++语言引用

也就是变量的别名

基本数据类型的引用

#include <iostream>
using namespace std;
int main(void)
{
    int a = 3;
    int &b = a; //引用必须初始化

    b = 10;
    cout << a << endl;
    return 0;
}

结构体类型的引用

#include <iostream>
using namespace std;

typedef struct
{
    int x;
    int y;
}Coor;
int main(void)
{
    Coor c1;
    Coor& c = c1;
    c.x = 10;
    c.y = 20;
    cout << c1.x << " " << c1.y << endl;
    return 0;
}

指针类型的引用

#include <iostream>
using namespace std;


int main(void)
{
    int a = 10;
    int *p = &a;
    int *&q = p;
    *q = 20;
    cout << a << endl;
    return 0;
}

引用做函数参数