C# Loops

C# Loops

Loops are a type of programming language that are used to repeat tasks. If we need to execute a block of code statement multiple times, then we can use any available loops.

C# For Loop

 
//For Loop Syntax

for (initialization; condition; increment/decrement) 
{
    // code block to be executed
}

 
using System;
                
public class Program
{
    public static void Main()
    {
        for(int i = 0; i <= 10; i++){    
            Console.WriteLine(i);    
        } 
    }
}

//Output: 0 1 2 3 4 5 6 7 8 9 10

 
using System;
            
public class Program
{
    public static void Main()
    {
        for(int i = 0; i <= 20; i = i + 2){    
            Console.WriteLine(i);    
        } 
    }   
}

//Output: 0 2 4 6 8 10 12 14 16 18 20

We can also have the nested loops we need while developing the application.

 
using System;
            
public class Program
{
    public static void Main()
    {
        for(int i=1; i<=2; i++){    
            for(int j=1; j<=2; j++){    
                Console.WriteLine(i+" "+j);    
            }
        }
    }
}

//Output:
1 1
1 2
2 1
2 2

The foreach loop in C#

 
foreach (type variableName in ArrayLists) 
{
    // block of code to be executed
}

 
using System;
            
public class Program
{
    public static void Main()
    {
        string[] listOfProgrammingLang = {"JavaScript", "Python", "Csharp", "AspDotNet", "HTML"}; 
        foreach (string lang in listOfProgrammingLang) 
        {
            Console.WriteLine(lang);
        }
    }
}

//Output: JavaScript Python Csharp AspDotNet HTML

The while loop in C#

 
//C# while loop syntax

while (condition) 
{
    //code to be executed
}

 
using System;
            
public class Program
{
    public static void Main()
    {
        int i = 0;
        while(i < 6){
            Console.WriteLine(i);
                i++;
        }
    }
}

//Output:0 1 2 3 4 5

The do-while loop in C#.

If we want to execute the code at least once then we can use the do-while loop.

 
//do while loop syntax
do 
{
    //code to be executed 
}
while (condition);

 
using System;
            
public class Program
{
    public static void Main()
    {
            int i = 1;
        
        do 
        {
            Console.WriteLine(i);
            i++;
        }
        while (i <= 5);
    }
}

//Output: 1 2 3 4 5