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For Loop and For-Each Loop in C#

Author: Gurunatha Dogi
Nov 19th, 2012
Comments : 3 | Views : 22591

Why Loops

If we want to perform the repetitive tasks “n” number of times or infinite number of times then it is good practice to use loops.

For Loops:

For loops are appropriate loops when you know exactly how many times iteration you wants in statements within the loop.

For loop iterates a statement or a block of statements repeatedly until a specified expression evaluates to false.

Syntax:

        for (; Boolean-expression;)
        
         ….Statement
        }

For Example:

            for(int I =0; I <= 20; I++)
            
               if(I%2 == 0)
                Console.WriteLine(“Print Even Numbers 0}”,I);
               }
               }

ForEach Loops

For-each loop is used to iterate through the items in object collections, List generic collections or array list collections.

Syntax:

         foreach (  )
        
         ….Statement
         }

For Example:

        string[] AnimalNames = new string[] "Dog","Tiger","Panda","Penguin" } 
        foreach (string animal in AnimalNames)
        
          Console.WriteLine(“Name of animal is 0}“,animal);
        }

Difference Between For and For Each Loop

For loop iterates a statement or a block of statements repeatedly until a specified expression evaluates to false.
For-each loop is used to iterate through the items in object collections, List generic collections or array list collections.
Performance: For Loops are faster than For-each Loop. If we iterate array list or any collection with for loop and for-each loop then you will find time consumed by for-each loop is much more than for loop so For loops are faster than For-each loop.

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Gurunatha Dogi is a software engineer by profession and founder of Onlinebuff.com, Onlinebuff is a tech blog which covers topics on .NET Fundamentals, Csharp, Asp.Net, PHP, MYSQL, SQL Server, Cell Phones and lots more. Follow me @ Google+ and twitter.