For Loop:
It’s preferred when you know how many iteration you want. It is used to executes a block of statements for as long as a specified condition is true.
General Syntax:
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for(Initialization; Test Condition; Increment) { Statement; } |
Example: To add the number from 1 to 10 by using for loop and sum the number by series of 1+2+3+…+10.
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int[] arry = new int[] {1,2,3,4,5,6,7,8,9,10 }; int s = 0; for (int i = 0; i < arry.Length; i++) { s = s+ arry[i]; } Console.WriteLine("Sum is: {0}",s); Console.ReadKey(); |
Output : Sum is:55
For Each Loop:
It operates on collections of items, for instance arrays or other built-in list types. It does not use an integer index. Instead, it is used on a collection and returns each element in order. In the foreach-statement, you do not need to specify the loop bounds minimum or maximum. It traverse whole collection.
General Syntax:
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foreach( Datatype item in items ) { Statement; } |
Example: To add the number from 1 to 10 by using foreach loop and sum the number by series of 1+2+3+…+10.
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int[] arry = new int[] {1,2,3,4,5,6,7,8,9,10 }; int s = 0; foreach (int i in arry) { s = s+ i; } Console.WriteLine("Sum is: {0}",s); Console.ReadKey(); |
Output : Sum is:55
Both the concepts are same only. For each is used for traversing items in a collection. It usually maintain no explicit counter and no use of index. They essentially say “do this to everything in this set”, rather than “do this x times”.For loop is classified as an iteration statement. The statements in the for loop repeat continuously for a specific number of times. It as counter and integer index (ex: a[i], i represent the index value and change it by increment operation on each iteration).
