C++ 利用new和delete创建和释放动态数组

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创建并释放一维数组

#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	int *arr = new int[10];//分配一维数组

	for (int i = 0; i < n; i++)
		cin >> arr[i];
	for (int i = 0; i < n; i++)
		cout << arr[i]<<" ";
	cout << endl;

	delete[] arr;         //释放arr数组   
	system("pause");
	return 0;
}

创建并释放二维数组

#include <iostream>
using namespace std;

int main()
{
	int row, col;
	cin >> row >> col;

	int **arr = new int *[row];   //为行指针分配空间
	for (int i = 0; i < col; i++) //每行col个元素
		arr[i] = new int[col];
	//输入二维数组元素
	for (int i = 0; i < row; i++)
	{
		for (int j = 0; j < col; j++)
			cin >> arr[i][j];
	}
	//输出二维数组元素
	for (int i = 0; i < row; i++)
	{
		for (int j = 0; j < col; j++)
			cout << arr[i][j];
	}
	//释放二维数组
	for (int i = 0; i < row; i++)
		delete[] arr[i];
	delete[] arr;

	system("pause");
	return 0;
}