difference between while and do while in c pdf Wednesday, May 5, 2021 2:36:25 AM

Difference Between While And Do While In C Pdf

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The Objective-C for loop described previously works well when you know in advance how many times a particular task needs to be repeated in a program.

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The Objective-C for loop described previously works well when you know in advance how many times a particular task needs to be repeated in a program. There will, however, be instances where code needs to be repeated until a certain condition is met, with no way of knowing in advance how many repetitions are going to be needed to meet that criteria.

To address this need, Objective-C provides the while loop yet another construct inherited by Objective-C from the C Programming Language. Essentially, the while loop repeats a set of tasks until a specified condition is met. The while loop syntax is defined follows:. For example:. In the above example, the while expression will evaluate whether the myCount variable is less than If it is already greater than the code in the braces is skipped and the loop exits without performing any tasks. If, on the other hand, myCount is not greater than the code in the braces is executed and the loop returns to the while statement and repeats the evaluation of myCount.

This process repeats until the value of myCount is greater than , at which point the loop exits. It is often helpful to think of the do The while loop evaluates an expression before executing the code contained in the body of the loop.

If the expression evaluates to false on the first check then the code is not executed. The do.. For example, you may want to keep stepping through the items in an array until a specific item is found. You know that you have to at least check the first item in the array to have any hope of finding the entry you need. The syntax for the do In the do As with the for loop, it is also possible to exit from a while or do while loop at any time through the use of the break statement. When the execution path encounters a break statement the looping will stop and execution will proceed to the code immediately following the loop.

In the following example, the loop is coded to exit when the value of i matches the value of j :. The continue statement causes all remaining code statements in a loop to be skipped, and execution to be returned to the top of the loop. In the following example, the NSLog function is only called when the value of variable i is an even number i. The continue statement in the above example will cause the NSLog call to be skipped unless the value of i can be divided by 2 with no remainder.

If the continue statement is triggered, execution will skip to the top of the while loop and the statements in the body of the loop will be repeated until the value of i exceeds 19 , resulting in the following output:. Jump to: navigation , search. Navigation menu Personal tools. Namespaces Page Discussion. Views Read View source View history. This page was last modified on 27 October , at Copyright Payload Media, Inc. All Rights Reserved.

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In this tutorial, we will learn the use of while and do For example, let's say we want to show a message times. Then instead of writing the print statement times, we can use a loop. Here, we are going to learn about while and do In this program, the user is prompted to enter a number, which is stored in the variable number.

A Loop executes the sequence of statements many times until the stated condition becomes false. A loop consists of two parts, a body of a loop and a control statement. The control statement is a combination of some conditions that direct the body of the loop to execute until the specified condition becomes false. The purpose of the loop is to repeat the same code a number of times. Types of Loops in C Depending upon the position of a control statement in a program, looping in C is classified into two types: 1. Entry controlled loop 2. Exit controlled loop In an entry controlled loop, a condition is checked before executing the body of a loop.

The loop statements while, do-while, and for allow us execute a statement(s) over and over. • Like a conditional, a loop is controlled by a boolean expression that.

What is the difference between while and do-while loops in C?

Previously you have learned about while loop and do while loop in C. Now, we will see the basic difference between while and do while with example. The while loop is pre-test loop , where firstly the condition is checked and if the condition is true then only the statements of the while loop execute. The do-while loop is a post-test loop. In the do-while loop, the statements of the do-while loop are executed after that, the condition is evaluated, and if the condition is true then again the statements of the do-while loop are executed.

C while and do...while Loop

Loops are one of the basic building blocks for creating programs.

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Rabulas B. 15.05.2021 at 03:54

In this tutorial you will learn how to repeat a series of actions using loops in JavaScript.