What is the while loop in C programming?

Answer 1

"while" is an entry controlled loop statement i.e the condition is evaluated first and if it is true the body of the loop is evaluated.This process is repeated until the test condition is false;then the control is transfered out of the loop.

The general form of while is as following

syntax:

while (<condition>)

{

<statements>;

}

Answer 2

While loop is one of the type of loops that C language offers, they are usually used when you are not concerned about the number of iterations a loop will follow. For

example:

char choice='y';

while(choice=='y')

{

scanf("%c",&chocie);

}

the above code will work while the user enters y

Answer 3

Well, the for loop and while loop are equivalent, in that you can use them both to do the same things. The difference is mainly syntactic. A for loop should be used to progress through a sequence, where there is a clear initialization, end test, and increment at each step through the loop, for example, to loop through the elements of an array or set. The while loop should be used when there isn't a clear progression, for example, to loop over input until the input is done.


the basic difference is that for loop is used when fixed iterations have to be performed whereas while loop is used when the number of times the loop construct is to be performed is not known..

Answer 4

for loop is suitable for situations when we know in advance how many times the loop will continue but while loop is suitable for situations when we don't know how many times the loop will iterate.

For example:

Display all the numbers from 1 to 10. here we know in advance the loop will continue 10 times , so for is suitable.

Count number of bits set to 1 in an integer 375. here in advance we don't know is the binary of 375 and how many bits are set 1, so while loop is suitable here.

Answer 5

The "while" loop is a function built-in C language which allows you to loop certain piece of code until the criteria is met instead of retyping the code all over again. For example, this is C# thought (similar concept, different syntax): string userInput = "0"; - define the variable to something else other than 'end' so the while loop executes the first time!

while(userInput != "end")

{

Console.WriteLine("The look will continue to print this text unless you type the word 'end' at the prompt!");

Console.WriteLine("Enter text: ");

userInput = Console.ReadLine();

}

Answer 6

while (expression) statement

do statement while (expression)

In the first form, expression is evaluated. If true, statement is executed and the loop repeats from the evaluation step. In the second form, statement is executed and then expression is evaluated. If true, the loop repeats from the statement step.

Answer 7

If you need to do something with repeation (calculating sums, integrals, adding users in the data base...) you have to use for or while loop.

Answer 8

I could give you the syntax of the while-statement, but it wouldn't help you. Please go and buy a good text-book.

while ()

Answer 9

A while loop iterates over the same code block until the control expression evaluates false.

Answer 10

Both of them is usable in C.