Part 13 - C# Tutorial - While loop in c#

In C#, while loop is used to iterate a part of the program several times. If the number of iteration is not fixed, it is recommended to use while loop than for loop.

Syntax:

1. while(condition){  
2. //code to be executed  
3. }  

Flowchart:

C# While Loop Example

Let's see a simple example of while loop to print table of 1.

1. using System;  
2. public class WhileExample  
3.     {  
4.       public static void Main(string[] args)  
5.       {  
6.           int i=1;    
7.           while(i<=10)   
8.           {  
9.               Console.WriteLine(i);  
10.               i++;  
11.           }    
12.      }  
13.    }  

Output:

1
2
3
4
5
6
7
8
9
10

C# Nested While Loop Example:

In C#, we can use while loop inside another while loop, it is known as nested while loop. The nested while loop is executed fully when outer loop is executed once.

Let's see a simple example of nested while loop in C# programming language.

1. using System;  
2. public class WhileExample  
3.     {  
4.       public static void Main(string[] args)  
5.       {  
6.           int i=1;    
7.           while(i<=3)   
8.           {  
9.               int j = 1;  
10.               while (j <= 3)  
11.               {  
12.                   Console.WriteLine(i+" "+j);  
13.                   j++;  
14.               }  
15.               i++;  
16.           }    
17.      }  
18.    }  

Output:

1 1
1 2
1 3
2 1
2 2 
2 3
3 1
3 2
3 3

C# Infinitive While Loop Example:

We can also create infinite while loop by passing true as the test condition.

1. using System;  
2. public class WhileExample  
3.     {  
4.       public static void Main(string[] args)  
5.       {  
6.           while(true)  
7.           {  
8.                   Console.WriteLine("Infinitive While Loop");  
9.           }    
10.       }  
11.     }  

Output:

Infinitive While Loop 
Infinitive While Loop
Infinitive While Loop
Infinitive While Loop
Infinitive While Loop
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