Iteration Statements

Introduction

Iteration Statements are often known as looping, and they run many times while specific condition is true. I would try to explain some of them here. The lesson is for a begginer, and I guess that everyone need to know them.

While

The While loop function used and while the condition is true, the loop statement executed.
the genral form of while loop:

Code:

 
while (Boolean exception)
         statement or block of statements

and here is an example of a program, that time the value of i between 0 to 20:

Code:

using System;

class Program
{
    static void Main(string[] args)
    {
        int i;
        i=0;
        while (i < 20)
        {
            Console.WriteLine(i);
            i++;
        }
    }
}

so, know that whe knows what is the While loop statement is lets go for anothe statment of loop.

Do...While

The do while is exactly as the While loop, and its run while the condition is true, and when the condition is true the compiler goes to the do block statement, and he runs it.

The genral Form OF the Do....while:

Code:

do
        statement or a block of statement
while(booleans expression);

and here is an example

Code:

using System;

class Program
{
    static void Main(string[] args)
    {
        int i;
        i=0;
        do
        {
            Console.WriteLine(i);
            i++;
        }while(i<20);
    }
}

In this line of codes , the compiler do the same thing he done at the while Program.

 

Can't we write the code like this?

Code:

using System;

class Program
{
    static void Main(string[] args)
    {
        int i;
        i=0;
        while (i++ < 20)
            Console.WriteLine(i);
    }
}

 

How and why will it be different?