For and While loop in C#

Amit Maheshwari

Hi friends,

I want to know that what's the difference between for loop and while loop? What are the task which can do with for not with while please explain in programming scenario?

4 Replies

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Senthilkumar14y ago
Accepted answer
Hi,

The for and while loop statement is used to iterate.

A while loop is very much similar to a for loop except that initialization, checking the boolean condition and incrementing the counter value is done at different steps as shown in the below example, otherwise while loop is same as the for loop.

The for loop has three parts.

Initialization
Condition
Increment/Decrement

for(int i=0;i<10;i++)
{
Console.WriteLine(i.toString());
}

While Loop:

int i =0;
while(i<10)
{
i = i+1;
}

Both can do the infinite loop:
for(;;)
{

}

while(true)
{

}

Differences:
While is an entry controlled loop. It is good for the boolean expression checking.

for loop is similar to while loop except that initialization statement, usually the counter variable initialization a statement that will be executed after each and every iteration in the loop, usually counter variable increment or decrement.

Mostly both has the common features.
FireMyst10y ago
One thing nobody really mentions here is speed. Which is faster depends on what you're iterating over. Here's a blog comparison that iterates over multiple kinds of objects, such as DataRows and custom objects with the various loop constructs so you can see how they perform:
http://cc.davelozinski.com/c-sharp/for-vs-foreach-vs-while
Saroj Kumar Sahu14y ago
A while loop will check a condition and then continues to execute a block of code as long as the condition evaluates to a boolean value of true.
using System;

class WhileLoop
{
    public static void Main()
    {
        int myInt = 0;

        while (myInt < 10)
        {
            Console.Write("{0} ", myInt);
            myInt++;
        }
        Console.WriteLine();
    }
}

A for loop works like a while loop, except that the syntax of the for loop includes initialization and condition modification. for loops are appropriate when you know exactly how many times you want to perform the statements within the loop.

class ForLoop
{
    public static void Main()
    {
        for (int i=0; i < 20; i++)
        {
            if (i == 10)
                break;

            if (i % 2 == 0)
                continue;

            Console.Write("{0} ", i);
        }
        Console.WriteLine();
    }
}
difference.
While: Keep going until this condition is met.
For: Keep going for X number of iterations.
qwerty14y ago
http://wiki.answers.com/Q/What_is_the_difference_between_a_for_loop_and_a_while_loop_and_what_are_their_uses