练习：试编写一个函数ChangeSize2D 来改变一个二维数组的大小

/*--------------------------------------------------试编写一个函数ChangeSize2D 来改变一个二维数组的大小---------------------------------------------*/#include <iostream>using namespace std;const int ROWS = 5;const int COLS = 10;template <class T>void DeleteSize2D(T **ch1, int rows);template <class T>T** ChangeSize2D(T **ch1, int rows, int cols){T **ch2 = new T* [rows];for (int i = 0; i < rows; i++)ch2[i] = new T [cols];for (int i = 0; i < rows; i++)for (int j = 0; j < cols; j++)ch2[i][j] = ch1[i][j];DeleteSize2D(ch1, ROWS);return ch2;}template <class T>T** CreateSize2D(T **ch1, int rows, int cols){ch1 = new T* [rows];for (int i = 0; i < rows; i++)ch1[i] = new T [cols];for (int i = 0; i < rows; i++)for (int j = 0; j < cols; j++)ch1[i][j] = 'A'+i+j;return ch1;}template <class T>void DeleteSize2D(T **ch1, int rows){for (int i = 0; i < rows; i++)delete [] ch1[i];delete [] ch1;ch1 = 0;}template <class T>void ShowSize2D(T **ch1, int rows, int cols){cout << "The Size2DArray = \n{\n";for (int i = 0; i < rows; i++){for (int j = 0; j < cols; j++)cout << ch1[i][j] << ", ";cout << endl;}cout << "}\n";}int main(){int rows, cols;char **ch1 = 0;ch1 = CreateSize2D(ch1, ROWS, COLS);ShowSize2D(ch1, ROWS, COLS);cout << "\nPlease change rows and cols the Size2DArray:\n";cin >> rows >> cols;if (rows == ROWS || cols == COLS)cout << "The Size2DArray needn't change!\n";else if (rows > ROWS || cols > COLS){cout << "The rows or cols is error!\n";exit(1);}else{ch1 = ChangeSize2D(ch1, rows, cols);ShowSize2D(ch1, rows, cols);}DeleteSize2D(ch1, rows);return 0;}