What is difference between For and foreach loop??

Question

Hello, What is difference between For and foreach loop??

Sam Hobbs · Answer

In addition to everything that has already been said, perhaps it would help to add that foreach is usuallly more convenient because it gives you an object that you can use in your code and that is a little easier to work with. It is a slight convenience for you. It might be less efficient for the computer but your efficiency is important too. Also, you can think of a for loop as a while loop with a couple of extra lines. For example: for (int i=0; i ; Is the same as or nearly the same as: int i = 0; while (i ++i;

Suthish Nair · Answer

The for loop executes a statement or a block of statements repeatedly until a specified expression evaluates to false. The for loop is useful for iterating over arrays and for sequential processing. Because the test of a conditional expression occurs before the execution of the loop, a for statement executes zero or more times. class ForLoopTest { static void Main() { for (int i = 1; i { Console.WriteLine(i); } } } The foreach statement repeats a group of embedded statements for each element in an array or an object collection. The foreach statement is used to iterate through the collection to get the desired information, but should not be used to change the contents of the collection to avoid unpredictable side effects. class ForEachTest { static void Main(string[] args) { int[] fibarray = new int[] { 0, 1, 2, 3, 5, 8, 13 }; foreach (int i in fibarray) { System.Console.WriteLine(i); } } } foreach loop may (not always, but depends) reduce the performance of the code. Therefore for loop is recommended. http://www.codeproject.com/KB/cs/foreach.aspx

Andrew Fenster · Answer

What Dorababu said is true. In addition, foreach is only good for looping through items in a collection. The for command is used for other things as well. For example, if you just want to perform an action a specific number of times you would do this: for (int x = 0; x For also allows a lot more control. Here I'm looping from 0 to somevalue in 5 unit increments: for (int x = 0; x Here I'm looping from 300 until x for(int x = 300; x As far as looping through each item in a collection, you can use for or foreach. Either one is fine.

Dorababu Meka · Answer

foreach is using IEnumerable to loop through collection. This makes it impossible to modify this collection(remove, add items), but you still can modify objects inside, if they are reference types. for is simple combination of simple loop combined with direct access to items in collection. There is no kind of blocking while this loop is going.

What is difference between For and foreach loop??

Answers (4)