The basics

Loops are way to reduce code by running the same code over and over again. The most common loop is the for-loop that iterates from a start number to an end number. The iterating number can be used in the loop.

Example:

			for (int i = 0;i <= 5 ;i++ ) {

				Console.WriteLine(i);

			}

This will output:
0
1
2
3
4
5

That's a basic loop.
There are 4 major ways to loop; For, Foreach, While, Do...While

For

As shown above the for loop iterates from a start number to an end number. This loop is great when you know how many times you want to loop. It's also good to use when you need an iterating number within the loop, using it as an indexer or such.

No example, look above.

Foreach

Foreach loops through every object in a collection. This loop is generally used with some sort of collection when you might now know the number of objects in the collection.

//Foreach with int


			int[] numbers = new int[]{1, 2, 3, 4, 5};

			

			Console.WriteLine("\nInt:");

			foreach(int i in numbers)

			{

				Console.WriteLine(i);

			}

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

While

While is like a mix of for and foreach. You use it when you don't know the exact amount of times you want to loop. This is however more often used combined with objects than with index iterators, though it can be used just like a for loop as well:

			int[] numbers = new int[]{1, 2, 3, 4, 5};

			int count = 0;

			

			//While with int


			while (count < numbers.Length) {

				Console.WriteLine(numbers[count]);

				count++;

			}

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

Do...While

Do...while is just like the while loop but it checks the condition after looping at least once.

			int[] numbers = new int[]{1, 2, 3, 4, 5};

			int count = 0;

                        //Do...while with int


			do	

			{

				Console.WriteLine(numbers[count]);

				count++;

			} while (count < numbers.Length);

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

The full code

			//A collection


			int[] numbers = new int[]{1, 2, 3, 4, 5};

			//An iterator


			int count = 0;

			

			//While with int


			while (count < numbers.Length) {

				Console.WriteLine(numbers[count]);

				count++;

			}

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

			count = 0;

			

			//Do...while with int


			do	

			{

				Console.WriteLine(numbers[count]);

				count++;

			} while (count < numbers.Length);

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

			

			//For loop with int


			for (int i = 0;i <= 5 ;i++ ) {

				Console.WriteLine(i);

			}

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */

			

			//Foreach with int


			foreach(int i in numbers)

			{

				Console.WriteLine(i);

			}

			/*Outputs:
			 * 1
			 * 2
			 * 3
			 * 4
			 * 5
			 */



			Console.Read();

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