两种动态创建二维数组的方法

#include<iostream>
#include<cstdlib>
#include<iomanip>
#include"windows.h"
using namespace std;
template <typename T>
void Creat_two_array(T **&x, const int &row,const int &col)
{
	x = new T *[row];
	for (int i = 0; i < row; i++)
		x[i] = new T[col];
}
template<typename T>
void Release(T ** &x, const int &row)
{
	for (int j = 0; j < row; j++)
		delete [] x[j];
	delete [] x;
	x = nullptr;//防止再次访问释放的内存
}
int main()
{
  //列已知的二维数组创建
	int n;
	cout << "Please input the row of array(column=5):";
	cin >> n;
	cout << "please input each elements of array.\n";
	int(*p)[5];//只知道列长度
	try{ p = new int[n][5]; }
	catch (bad_alloc e)
	{
		cerr << "Out of memory" << endl;
		exit(EXIT_FAILURE);
	}
	for (int i = 0; i < n;i++)
	for (int j = 0; j < 5; j++)
		cin >> p[i][j];
	cout << "This array is:\n";
	cout.setf(ios_base::right, ios_base::adjustfield);//fmtflags
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < 5; j++)
			cout << setw(3) << p[i][j];
		cout << endl;
	}
	delete[] p;
	//动态分配行列均不知道的二维数组
	int col, row,**num;
	cout << "please input two number(row,column):";
	cin >> row >> col;
	Creat_two_array<int>(num, row, col);
	cout << "please input each elements of array.\n";
	for (int i = 0; i < row; i++)
	for (int j = 0; j < col; j++)
		cin >> num[i][j];
	cout << "This array is:\n";
	cout.setf(ios_base::left, ios_base::adjustfield);//fmtflags
	for (int i = 0; i < row; i++)
	{
		for (int j = 0; j < col; j++)
			cout << setw(3) << num[i][j];
		cout << endl;
	}
	Release<int>(num, row);
  system("pause");
  return 0;
}

程序运行结果如下