二维数组定义的四种方式
	//二维数组定义方式
	/*
	1. 数据类型 数组名[行数][列数];
	2. 数据类型 数组名[行数][列数]={{数据1,数据2},{},{}};
	3. 数据类型 数组名[行数][列数]={数据1,数据2。。}
	4. 数据类型 数组名[][列数]={数据1,数据2,数据3};
	*/
	// 1. 数据类型 数组名[行数][列数];
	/*int arr[2][2];
	arr[0][0] = 4;
	arr[0][1] = 3;
	arr[1][0] = 9;
	arr[1][1] = 7;*/
	//2. 数据类型 数组名[行数][列数] = { {数据1,数据2},{},{} };
	/*int arr[2][3] =
	{
		{1,2,3},{4,5,6}
	};*/
	//3. 数据类型 数组名[行数][列数] = { 数据1,数据2 }
	// 系统自动分配
	/*int arr[2][3] =
	{ 1,2,3,4,5,6 };*/
	//4. 数据类型 数组名[][列数] = { 数据1,数据2,数据3 }
	int arr[][3] = { 1,2,3,4,5,6 };

	for (int i = 0; i < 2; i++)
	{
		for (int j = 0; j < 3; j++)
		{
			cout << arr[i][j] << "\t";
		}
		cout << endl;
	}
	cout << endl;
二维数组名称用途
// 二维数组名称用途
	//1.可以查看内存空间大小
	//  某一行/个元素占用的内存
	int arr[2][3] =
	{
		{1,2,3},
		{4,5,6}
	};
	cout << "二维数组占用的内存空间:" << sizeof(arr)
		<< endl;
	cout << "二维数组第一行占用内存:" << sizeof(arr[0])
		<< endl;
	cout << "二维数组第一个元素占用内存:" << sizeof(arr[0][0])
		<< endl;
	cout << "二维数组行数:";
	cout << sizeof(arr) / sizeof(arr[0]) << endl;
	cout << "二维数组列数:";
	cout << sizeof(arr[0]) / sizeof(arr[0][0]) << endl;


	//2.可以查看二维数组的首地址
	cout << "二维数组首地址为:";
	cout << arr << endl;
	cout << "二维数组第二行首地址:";
	cout << arr[1] << endl;
	cout << "二维数组第一个元素地址:";
	cout << &arr[0][0] << endl;
打印分数
	int score[3][3] =
	{
		{100,100,100},
		{90,89,93},
		{70,90,96}
	};
	string name[3] = { "张三","李四","王五" };
	string total[5] = { "姓名","语文","数学","英语","总分"};
	for (int i = 0; i < 5; i++)
	{
		cout << total[i] << '\t';
	}
	cout << endl;
	for (int i = 0; i < 3; i++)
	{
		cout << name[i] << "\t";
		int sum = 0;
		for (int j = 0; j < 3; j++)
		{
			sum += score[i][j];
			cout << score[i][j] << "\t";
		}
		cout << sum;
		cout << endl;
	}
	cout << endl;
	// 1.定义指针
	int a = 10;
	int* p = &a;
	cout << *p << " " << p << endl;
	int& t = a;
	cout << t << " " << &t << endl;