c++ 使用new动态的创建指定大小的二维数组

// test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "iostream"
#include "utility.h"

using namespace std;

int age=18;

int _tmain(int argc, _TCHAR* argv[])
{
int a=5;
//printf("%d",a);
cout<<"please input dim N"<<endl;
int N=0;
cin>>N;
printf("\n");
int** arr=new int*
;
for (int i=0;i<N;i++)
{
//
arr[i]=new int
;
}
int count=0;
for (int i=0;i<N;i++)
{
for (int j=0;j<N;j++)
{
arr[i][j]=count;
count++;
}
}
for (int i=0;i<N;i++)
{
for (int j=0;j<N;j++)
{
printf("%4d",arr[i][j]);
}
printf("\n");
}
system("pause");
delete [] arr;
return 0;
}

// test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "iostream"
#include "utility.h"

using namespace std;

int age=18;

int _tmain(int argc, _TCHAR* argv[])
{
int a=5;
//printf("%d",a);
cout<<"please input dim 1 N, dim 2 M"<<endl;
int N=0;
int M=0;
cin>>N>>M;
printf("\n");
int** arr=new int*
;
for (int i=0;i<N;i++)
{
//
arr[i]=new int[M];
}
int count=0;
for (int i=0;i<N;i++)
{
for (int j=0;j<M;j++)
{
arr[i][j]=count;
count++;
}
}
for (int i=0;i<N;i++)
{
for (int j=0;j<M;j++)
{
printf("%4d",arr[i][j]);
}
printf("\n");
}
system("pause");
delete [] arr;
return 0;
}