基本语法和数组(二维,多维,交错数组)

    class Program{static void Main(string[] args){// TestJiaoCuo();
            Console.ReadKey();}//交错数组.static void TestJiaoCuo(){//交错数组. 交错数组的本质是1个1维数组 只不过这个1维数组的元素又是数组,.int[][] arr = new int[3][];arr[0] = new int[3];arr[1] = new int[5];arr[2] = new int[4];Console.WriteLine(arr.Rank);//数组的维数 交错数组是1Console.WriteLine(arr.Length);//长度是3//遍历//foreach (int[] item in arr)//{//    foreach (int i in item)//    {//        Console.WriteLine(i);//    }//}for (int i = 0; i < arr.Length; i++){for (int j = 0; j < arr[i].Length; j++){Console.WriteLine(arr[i][j]);}}int[][][] arr1 = new int[3][][];}static void TestDuowei(){int[, ,] arr = new int[3, 4, 5];}static void TestIf(){int lwh = 900;if (lwh > 1000)  //条件表达式或者是1个bool类型的变量
            {Console.WriteLine("中午请吃饭.");}else if (lwh > 800){Console.WriteLine("中餐.");}else if (lwh > 500){Console.WriteLine("小餐.");}else{Console.WriteLine("大家请他吃饭....");}Console.WriteLine("这里是继续往下的代码...");}static void TestSwitch(){//switch只能判断等值 ifelse可以判断等值也可以判断范围.int score = 78;switch (score / 10){case 10:case 9:Console.WriteLine("A");break;case 90:Console.WriteLine("A");break;}}static void TestWhie(){//while (true)//{//    Console.WriteLine("A");//}//do//{//}while();  for (int i = 0; i < 10; i++){Console.WriteLine("A");break;//
                continue;}}static void Test2(){//二维数组表示1个表格  2行3列int[,] arr = new int[2, 3];//Length属性代表数组的长度 行*列//Console.WriteLine(arr.Length);//Console.WriteLine(arr[1,1]); //得到指定维度的长度arr.GetLength(1);for (int i = 0; i < arr.GetLength(0); i++)//2{for (int j = 0; j < arr.GetLength(1); j++)//3{Console.WriteLine(arr[i, j]);}}Console.WriteLine("**************");Console.WriteLine(arr.Rank);//遍历//foreach (int i in arr)//{//    Console.WriteLine(i);//} 
}}