指针（pointer）的使用

1、变量的指针和指针的变量

变量的指针：变量的存储地址，

指针变量：存储指针的变量

2、指针变量的基本符号

&：取地址符号

*：间接取址符号

NULL||0：初始化

**：多级指针

*p[]：指针数组

3、程序实例（自己 尝试写类函数，一直不懂啥时候才定义变量位为private

//*m:定义指针变量  &m：取m的地址 *&m：间接访问 m的内容
//&和 *互为逆运算

#include <iostream>
#include<stdlib.h>
using namespace std;
/*void main(){
    int *x, *y;
    int m, n;
    cout << "请输入m和n" << endl;
    cin >> m >> n ;
    x = &m;
    y = &n;
    cout << *x << " " << *y << endl;
    int *temp;
    temp = x;
    x = y;
    y = temp;
    cout << *x << " " << *y << endl;

}*/
class pointer{
public:
    void _cinvlauemn();
    void _cinvaluea();
    void _swappointer();
    void _pointerarray();
private:
    int m, n;
    int a[5];
};//一定要记得输入分号
void pointer::_cinvlauemn(){
    cout << "请输入m和n" << endl;
    cin >> m >> n;
}
void pointer::_cinvaluea(){
    cout << "请输入数组值： " << endl;
    for (int i = 0; i < sizeof(a) / sizeof(int); i++){
        cin >> a[i];
    }
}
void pointer::_swappointer(){
    int *x=NULL, *y=0;//初始化
    x = &m;
    y = &n;
    cout << *x << " " << *y << endl;
    int *temp;
    temp = x;
    x = y;
    y = temp;
    cout << *x << " " << *y << endl;
}
void pointer::_pointerarray(){
    int *p[5];
    for (int i = 0; i < 5; i++){
        p[i] = &a[i];
    }
    int **pp;
    pp = p;//把指针数组p的首地址给pp
    for (int i = 0; i < 5; i++){
        cout << **pp << " ";
        pp++;
    }
}
void main(){
    pointer function;
    function._cinvlauemn();
    function._cinvaluea();
    function._swappointer();
    function._pointerarray();
}

4、运行结果