Initialization and Declaration of Array in C#

In this chapter you will learn:
  • What is array?
  • How to declare array?
  • How to use array in C# programming?

Sometimes, you need to declare multiple variable of same data type. It is complex and time consuming process. Just for an example, you have to declare 100 integer type of variable then what would you do? Will you declare variable as follow:

int num1,num2,num3,num4,num5,num6,num7,num8.... num100;

It is not a suitable way to declare multiple variable of same data type. To overcome this situation, array came alive. An array is a collection of same data type. If you have to declare 100 variable of same data type in C#, then you can declare and initialize an array as follow.

int[] num = new int[100];

Structure of C# array

To understand concept of array, consider the following example. What happens in memory when we declare an integer type array?
int[] num = new int[6];

Num Array: declaring-array-flowchart

It stores the values in the index position of the array starting with 0.

num[0] = 6;
num[1] = 23;
num[2] = 12;
num[3] = 9;
num[4] = 14;
num[5] = 52;

Now, you can access the value of array by index position. Such as if you have to access 3rd index of value, then you can write as follow:

int i = num[2];

 

Programming Example of Array

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Declare_Array
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] num = new int[6]; //Declaring Array

            //Initializing array
            num[0] = 6;
            num[1] = 23;
            num[2] = 12;
            num[3] = 9;
            num[4] = 14;
            num[5] = 52;

            //Showing value of Array
            Console.WriteLine("1st value:\t{0}", num[0]);
            Console.WriteLine("2nd value:\t{0}", num[1]);
            Console.WriteLine("3rd value:\t{0}", num[2]);
            Console.WriteLine("4th value:\t{0}", num[3]);
            Console.WriteLine("5th value:\t{0}", num[4]);
            Console.WriteLine("6th value:\t{0}", num[5]);

            Console.ReadLine();
        }
    }
}

Output

1st value:       6
2st value:       23
3st value:       12
4st value:       9
5st value:       14
6st value:       52
__

In next chapter, you will learn how to store value in array

.

Summary

In this chapter you learned about what is array in C#. You also learned how to declare array in c sharp proramming. In next chapter, you will learn how to store value in array.

More Examples

Write A Program To Print One Dimensional Array In Reverse Order
Write A Program To Sort One Dimensional Array In Descending Order Using Non Static Method.
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Write A Program To Sort One Dimensional Array In Ascending Order Using Non Static Method.
Write A Program To Sort One Dimensional Array In Ascending Order Using Static Method.
Write A Program To Add The Diagonal Of Two-Dimensional Array.

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