c++ 用new創建二維數組~創建指針數組【轉】

#include <iostream>
using namespace std;

void main()
{
//用new創建一個二維數組,有兩種方法,是等價的
//一:
int (*p)[10] = new int[5][10];
//二:
int **p = new int* [5];
for(int i=0;i <5;i++)
p[i] = new int[10];

//指針數組的創建,也有兩種方法
//一:
char **pa = new char* [4];
for (int i=0;i <4;i++)
{
pa[i] = new char[8]; //為每個指針都分配8個char元素空間。
}
//二:
char *pa[4];//可以不用new創建
for (int i=0;i <4;i++)
{
pa[i] = new char[8]; //為每個指針都分配8個char元素空間。
}


//delete二維數組
//for一:
delete []p;
//for二:
for(int i=0; i <5; ++i)
delete []p[i];
delete []p;

//delete指針數組
//for一:
for(int i=0; i <4; ++i)
delete []pa[i];
delete []pa;
//for二:
for(int i=0; i <4; ++i)
delete []pa[i];
}

from here