When is the loop condition evaluated in a pretest

Show method will not be processed even once. Thus, here since the condition is false, the body of the loop will be executed once, and thus MessageBox. Show will be processed only once. So even if the condition is false, the loop body is executed at least once. Whereas the instructions in a pretest loop is not processed if the condition is false, since the condition is checked before the body of the loop is executed.

Participate in the Certification contest to get free Certificate of Merit. Why Repetition is Needed: Repetition structures, or loops, are used when a program needs to repeatedly process one or more instructions until some condition is met, at which time the loop ends. Many programming tasks are repetitive, having little variation from one item to the next.

A loop executes the same section of program code over and over again, as long as a loop condition of some sort is met with each iteration. This section of code can be a single statement or a block of statements a compound statement.

Loops and Using Loops. Contrast with the while loop , which tests the condition before the code within the block is executed, the do-while loop is an exit- condition loop. So the pre- check means that the loop iterator variable is checked before the code inside the loop is executed and the post - check means that the iterator is checked after the code in the loop is run. With the post - check method the code is run at least once.

This may, or may not, be what you want to happen. Asked by: Caetano Altube sports climbing What is meant by pretest and posttest loop? Last Updated: 9th June, Pretest and Posttest. A pretest loop is one in which the block is to be repeated until the specified condition is no longer true, and the condition is tested before the block is executed.

Wolfram Isasa Professional. Which is used to terminate a loop? The break statement:. Elisio Irauzketa Professional. What is the Do While loop syntax? If the condition is true, the flow of control jumps back up to do , and the statement s in the loop executes again.

What is pre tested looping structure? We have seen two types of loops so far: The pretest loop. This is where the condition necessary to continue looping is checked before the instructions within the loop are executed.

Tsvetana Lugilde Explainer. How many times will the following loop be executed? Hi Rodrigo, the loop will execute one single time. That's because it first executes the block of code and evaluates the condition in the "while" part after, deciding then if it must loop again or not. Lutz Landi Explainer. Is a while loop a pretest loop? Each repetition of a loop is called an iteration. The while loop is known as a pretest loop , because it tests the boolean expression before it executes the statements in its body.

Gianfranco Mugika Explainer. What is infinite loop in C? The Infinite Loop in C. A loop that repeats indefinitely and never terminates is called an Infinite loop. Infinite loops are commonly used in programs that keep running for long periods of time until they are stopped like the web server. What is a loop control variable? Loop Control Variable.

The variable count is initialized, tested, and changed as the loop executes.