//聲明并初始化數(shù)組
short array2d[5][5] = {{5,2,8,4,1},
                       {2,2,4,6,8},
                       {1,5,8,9,4},
                       {5,7,6,2,5},
                       {7,6,5,8,1}};
 
//聲明并初始化指針一：以下幾種賦值結(jié)果對ptra等效
short (*ptra)[5] = array2d;     //方式一：值為0x00BCF8FC
short (*ptra)[5] = &array2d[0]; //方式二：值為0x00BCF8FC
 
//聲明并初始化指針二
short (*ptrb)[5][5] = &array2d; //值為0x00BCF8FC
 
//聲明并初始化指針三：以下幾種賦值結(jié)果對ptrc等效
short *ptrc = &array2d[0][0];   //方式一：值為0x00BCF8FC
short *ptrc = array2d[0];       //方式二：值為0x00BCF8FC
 
//聲明并初始化指針?biāo)模阂韵聨追N賦值結(jié)果對ptrd等效
short *ptrTmp[5] = {array2d[0],array2d[1],array2d[2],array2d[3],array2d[4]};
short** ptrd = ptrTmp;          //方式一：值為0x00BCF8A4
short** ptrd = new short*[5]{
    array2d[0],
    array2d[1],
    array2d[2],
    array2d[3],
    array2d[4]};                //方式二：值為0x01156470，需配合使用delete[]釋放內(nèi)存
short** ptrd = new short*[5]();
ptrd[0] = array2d[0];
ptrd[1] = array2d[1];
ptrd[2] = array2d[2];
ptrd[3] = array2d[3];
ptrd[4] = array2d[4];           //方式三：值為0x01046AE0，需配合使用delete[]釋放內(nèi)存
 
//訪問數(shù)組第3行第4列的元素
cout << array2d[2][3];    //結(jié)果為9
cout << *(array2d[2]+3);  //結(jié)果為9
cout << *(*(array2d+2)+3);//結(jié)果為9
 
cout << ptra[2][3];     //結(jié)果為9
cout << *(ptra[2]+3);   //結(jié)果為9
cout << *(*(ptra+2)+3); //結(jié)果為9
 
cout << (*ptrb)[2][3];  //結(jié)果為9
cout << *((*ptrb)[2]+3);//結(jié)果為9
cout << *(*(*ptrb+2)+3);//結(jié)果為9
 
cout << ptrc[2*5+3];    //結(jié)果為9
cout << *(ptrc+2*5+3);  //結(jié)果為9
 
cout << ptrd[2][3];     //結(jié)果為9
cout << *(ptrd[2]+3);   //結(jié)果為9
cout << *(*(ptrd+2)+3); //結(jié)果為9
 
//應(yīng)用指針?biāo)阈g(shù)時單位1表示的字節(jié)數(shù)
cout << int(array2d+1)-int(array2d);              //結(jié)果為10
cout << int(&array2d[0]+1)-int(&array2d[0]);      //結(jié)果為10
cout << int(&array2d+1)-int(&array2d);            //結(jié)果為50
cout << int(&array2d[0][0]+1)-int(&array2d[0][0]);//結(jié)果為2
cout << int(array2d[0]+1)-int(array2d[0]);        //結(jié)果為2
 
cout << int(ptra+1)-int(ptra);      //結(jié)果為10
cout << int(ptrb+1)-int(ptrb);      //結(jié)果為50
cout << int(ptrc+1)-int(ptrc);      //結(jié)果為2
cout << int(ptrd+1)-int(ptrd);      //結(jié)果為4
 
//應(yīng)用sizeof()獲得內(nèi)存量大小
cout << sizeof(array2d);       //結(jié)果為50
cout << sizeof(&array2d[0]);   //結(jié)果為4
cout << sizeof(&array2d);      //結(jié)果為4
cout << sizeof(&array2d[0][0]);//結(jié)果為4
cout << sizeof(array2d[0]);    //結(jié)果為10
cout << sizeof(array2d[0][0]); //結(jié)果為2
 
cout << sizeof(ptra);   //結(jié)果為4
cout << sizeof(ptrb);   //結(jié)果為4
cout << sizeof(ptrc);   //結(jié)果為4
cout << sizeof(ptrd);   //結(jié)果為4

#include <iostream>
using namespace std;
int main()
{
    // a是一個二維數(shù)組名，指向一個二維數(shù)組
    int a[2][3] = {{1,2,3},{4,5,6}};
    // a所占的內(nèi)存為24，即6*4
    cout<<sizeof(a)<<endl;
    // 輸出為4
    // a:&a[0]   a+1:&a[1]  *(a+1) : a[1] = &a[1][0]
    // **(a+1) = a[1][0]
    cout<<**(a+1)<<endl;
    // 輸出為3
    // a:&a[0]  *a:a[0]:&a[0][0]  *a+2:&a[0][2]
    // *(*a+2):a[0][2]
    cout<<*(*a+2)<<endl;

    // 數(shù)組指針
    int (*b)[3] = a;
    // 數(shù)組指針可以當(dāng)做二維數(shù)組名用
    cout<<**(b+1)<<endl;
    cout<<*(*b+2)<<endl;

    cout<<sizeof(b)<<endl;
}