Question

error C2440: 'initializing' : cannot convert from 'int (*)[4]' to 'int *' Types pointed to are un

#include <iostream>
#include<string>

using namespace std;

int main()
{

int* pi=new int[2][4];

//cout<<*pi<<" "<<pi<<endl;
delete pi;
return 0;
}

编译时出现如下错误请解释一下？
error C2440: 'initializing' : cannot convert from 'int (*)[4]' to 'int *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Answer 1

int * pi = new int[2][4] 应该改成 int **pi = new int[2][4] 或者改成 int *pi = new[2]。主要看你想怎么用，
而且如果你知道你在做什么的话可以改成 int *pi = (int*) new int[2][4];

Answer 2

二维数组的空间分配不是这样的，正确的做法是这样的：
int ** pi = new int[2];
int i;
for(i=0;i<2;i++)
{
pi[i] = new int[4];
}

删除时，
for(i=0;i<2;i++)
{
delete []pi[i];
}
delete []pi;