While Loop

The `while loop is almost similar to the `for' loop with some difference in the syntax:

initialize loop;
while (check condition)
{
//statements inside the loop
update loop
}

In a `while' loop, the initialization is done outside the loop and the updating is done inside the loop. Apart from these differences, the working of the `while' loop is similar to that of the `for' loop.

We can convert the example shown in the `for' loop using the `while' loop as shown in the following code:

static void Main(string[] args) { int i, num, sum; 
sum = 0; 
i = 0; 
while(i < 5) 
{ 
Console.WriteLine("Enter a number"); 
num = int.Parse(Console.ReadLine()); 
sum = sum + num; i++; 
}

Console.WriteLine("The sum of all the numbers is {0}", sum); 
}