C# For Loop

The C# for loop is used to iterate a part of the program several times. If the number of iteration is fixed, it is recommended to use for loop than while or do-while loops.

The C# for loop is same as C/C++. We can initialize variable, check condition and increment/decrement value.

Syntax

for(initialization; condition; incr/decr){
//code to be executed
}

Flowchart:

Example

snippet

using System;
public class ForExample
    {
      public static void Main(string[] args)
      {
          for(int i=1;i<=10;i++){  
            Console.WriteLine(i);  
          }  
      }
    }

Output

1 2 3 4 5 6 7 8 9 10

C# Nested For Loop

In C#, we can use for loop inside another for loop, it is known as nested for loop. The inner loop is executed fully when outer loop is executed one time. So if outer loop and inner loop are executed 3 times, inner loop will be executed 3 times for each outer loop i.e. total 9 times.

Example

Let's see a simple example of nested for loop in C#.

snippet

using System;
public class ForExample
    {
      public static void Main(string[] args)
      {
        for(int i=1;i<=3;i++){  
                for(int j=1;j<=3;j++){  
                    Console.WriteLine(i+" "+j);  
                }  
        }  
      }
    }

Output

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

C# Infinite For Loop

If we use double semicolon in for loop, it will be executed infinite times. Let's see a simple example of infinite for loop in C#.

Example

snippet

using System;
public class ForExample
    {
      public static void Main(string[] args)
      {
          for (; ;)
          {
                  Console.WriteLine("Infinitive For Loop");
          }  
      }
 }

Output

Infinitive For Loop Infinitive For Loop Infinitive For Loop Infinitive For Loop Infinitive For Loop ctrl+c