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  • c#语法练习 7 数组

制作者:剑锋冷月 单位:无忧统计网,www.51stat.net
 

  字符串数组:


using System;

class MyClass
{
  static void Main()
  {
    string[] arr = new string[3] { "aa", "bb", "cc" };

    foreach (string s in arr) Console.WriteLine(s); // aa/bb/cc

    Console.ReadKey();
  }
}

  整数数组:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr = { 11, 22, 33 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  初始化时维数可以省略; 若不省略, 得一致:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr = new int[3] { 11, 22, 33 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  声明同时指定维数, 但暂不赋值:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr = new int[3];

    foreach (int i in arr) Console.WriteLine(i); // 0/0/0

    arr[0] = 11;
    arr[1] = 22;
    arr[2] = 33;
    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

 

  先声明, 赋值时再确定维数:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr;
    arr = new int[] { 11, 22, 33 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  可改变声明时的维数:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr = new int[3];
    arr = new int[4] { 11, 22, 33, 44 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33/44

    Console.ReadKey();
  }
}

  如果用变量做数组维数, 一定要是 const:


using System;

class MyClass
{
  static void Main()
  {
    const int size = 3;

    int[] arr = new int[size] { 11, 22, 33};

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  二维数组初始化:


using System;

class MyClass
{
  static void Main()
  {
    int[,] arr = { {11,12,13,14}, {21,22,23,24}, {31,32,33,34} };

    foreach (int i in arr) Console.WriteLine(i);

    Console.ReadKey();
  }
}

  二维数组赋值:

 


using System;

class MyClass
{
  static void Main()
  {
    int[,] arr = new int[3, 4];

    arr[0,0] = 11;
    arr[0,1] = 12;
    arr[0,2] = 13;
    arr[0,3] = 14;
    arr[1,0] = 21;
    arr[1,1] = 22;
    arr[1,2] = 23;
    arr[1,3] = 24;
    arr[2,0] = 31;
    arr[2,1] = 32;
    arr[2,2] = 33;
    arr[2,3] = 34;

    foreach (int i in arr) Console.WriteLine(i);

    Console.ReadKey();
  }
}

  多维数组:


using System;

class MyClass
{
  static void Main()
  {
    int[,,] arr = new int[2, 3, 4];

    for (int x = 0; x < 2; x++) for (int y = 0; y < 3; y++) for (int z = 0; z < 4; z++)
      arr[x,y,z] = Convert.ToInt32(Convert.ToString(x+1) + Convert.ToString(y+1) + Convert.ToString(z+1));

    foreach (int i in arr) Console.WriteLine(i);

    Console.ReadKey();
  }
}

  数组中的数组:


using System;

class MyClass
{
  static void Main()
  {
    int[][] arr = new int[3][];
    arr[0] = new int[2] { 11, 12 };
    arr[1] = new int[3] { 21, 22, 23 };
    arr[2] = new int[4] { 31, 32, 33, 34 };

    foreach (int[] ns in arr) foreach (int n in ns)
        Console.WriteLine(n);

    Console.ReadKey();
  }
}


		

 

 

  先声明, 赋值时再确定维数:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr;
    arr = new int[] { 11, 22, 33 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  可改变声明时的维数:


using System;

class MyClass
{
  static void Main()
  {
    int[] arr = new int[3];
    arr = new int[4] { 11, 22, 33, 44 };

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33/44

    Console.ReadKey();
  }
}

  如果用变量做数组维数, 一定要是 const:


using System;

class MyClass
{
  static void Main()
  {
    const int size = 3;

    int[] arr = new int[size] { 11, 22, 33};

    foreach (int i in arr) Console.WriteLine(i); // 11/22/33

    Console.ReadKey();
  }
}

  二维数组初始化:


using System;

class MyClass
{
  static void Main()
  {
    int[,] arr = { {11,12,13,14}, {21,22,23,24}, {31,32,33,34} };

    foreach (int i in arr) Console.WriteLine(i);

    Console.ReadKey();
  }
}

  二维数组赋值: 



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