Arrays - CSharp Language Basics

CSharp examples for Language Basics:Array

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Introduction

An array represents a fixed number of variables (elements) of a particular type.

An array is denoted with square brackets after the element type. For example: 

char[] vowels = new char[5];    // Declare an array of 5 characters

Square brackets also index the array, accessing a particular element by position:

Demo Code

using System;/*from  ww w . jav  a  2s .co m*/
class Test
{
   static void Main(){
      char[] vowels = new char[5];    // Declare an array of 5 characters
      vowels[0] = 'a';
      vowels[1] = 'e';
      vowels[2] = 'i';
      vowels[3] = 'o';
      vowels[4] = 'u';
      Console.WriteLine (vowels[1]);      // e
   }
}

Result

The for loop in this example cycles the integer i from 0 to 4:

Demo Code

using System;/*from  w  w  w .ja  va 2  s . c  o m*/
class Test
{
static void Main(){
     char[] vowels = new char[5];    // Declare an array of 5 characters
     vowels[0] = 'a';
     vowels[1] = 'e';
     vowels[2] = 'i';
     vowels[3] = 'o';
     vowels[4] = 'u';

     for (int i = 0; i < vowels.Length; i++)
       Console.Write (vowels[i]);            // aeiou

}
}

Result

The Length property of an array returns the number of elements in the array.

Once an array has been created, its length cannot be changed.

An array initialization expression lets you declare and populate an array in a single step: 

char[] vowels = new char[] {'a','e','i','o','u'};

or simply: 

char[] vowels = {'a','e','i','o','u'};

All arrays inherit from the System.Array class, providing common services for all arrays.


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