Is a while loop a pretest or posttest?

Last Update: May 30, 2022

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Asked by: Tianna Rodriguez
Score: 4.3/5 (48 votes)

2. A pretest loop tests its condition before each iteration. A posttest loop tests its condition after each iteration. ... The while loop is a pretest loop and the do-while loop is a posttest loop.

Is a while loop a pretest loop?

Flowchart for the above loop

 The while loop is known as a pretest loop, because it tests the boolean expression before it executes the statements in its body.

What type of loop is a while loop?

While Loop is a type of loop that is used when you don't know exactly how many times the code will repeat. It's based on a condition, so the instruction inside the while should be either a boolean value (True/False) or an operator that returns a boolean (<,>,==, etc.).

Which are pre-test loops?

DEFINITION: Pre-test Loop

A pre-test loop is one in which the loop condition is tested before entering the loop. There are several popular variations of the pre-test loop. The most common of these is the While Loop. The concept of a While Loop is almost the same as the If Statement.

What is a post-test loop example?

Post-Test Loop

If it executes the while statements, it then checks the condition again to determine if the statements should be executed again. ... For this simple example, we could just have a print statement before the while loop and then check the i value in the while condition.

PreTest vs PostTest 080916

23 related questions found

What is the difference between pretest loops and posttest loops?

A pretest loop tests its condition before each iteration. A posttest loop tests its condition after each iteration. A posttest loop will always execute at least once. ... Because they are only executed when a condition is true.

What is while loop example?

A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10".

Why use a while loop instead of a for loop?

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

How does a while loop start?

JavaScript while loop examples

First, outside of the loop, the count variable is set to 1. Second, before the first iteration begins, the while statement checks if count is less than 10 and execute the statements inside the loop body.

Which is a post tested loop?

Because do while loops check the condition after the block is executed, the control structure is often also known as a post-test loop. 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.

What is the difference between a pretest and a posttest?

Typically, a pretest is given to students at the beginning of a course to determine their initial understanding of the measures stated in the learning objectives, and posttest is conducted just after completion of the course to determine what the students have learned.

Which is used to terminate a loop?

Break Statement is a loop control statement that is used to terminate the loop. As soon as the break statement is encountered from within a loop, the loop iterations stop there, and control returns from the loop immediately to the first statement after the loop.

What are two ways to end a loop?

The only way to exit a loop, in the usual circumstances is for the loop condition to evaluate to false. There are however, two control flow statements that allow you to change the control flow. continue causes the control flow to jump to the loop condition (for while, do while loops) or to the update (for for loops).

Is a while loop more efficient than a for loop?

Generally, the for loop can be more efficient than the while loop, but not always. The idea of the While loop is: While something is the case, do the following block of code. ... This is easiest done with the help of a while loop.

How many times at a minimum will a do while loop execute?

Depends on how you write it. If while(){} , then yes, the minimum number of times is 0. If not talking about the DO, then it's 0. Yes, if the while's condition isn't satisfied at the first time, the loop is executed zero times.

Why would you use a for loop?

A "For" Loop is used to repeat a specific block of code a known number of times. For example, if we want to check the grade of every student in the class, we loop from 1 to that number. When the number of times is not known before hand, we use a "While" loop.

What is the difference between a for loop and a while loop Codehs?

Use for-loops when you want to repeat something a fixed number of times. Use while-loops when you want to repeat something as long as a condition is true.

How do you write a while loop?

Start the while loop by writing a do while command.

The while command usually includes the words "do while," along with other minimal code.

What is the difference between while loop and do while loop explain with example?

do-while loop: do while loop is similar to while loop with the only difference that it checks for the condition after executing the statements, and therefore is an example of Exit Control Loop.

What is a counted loop?

A common type of program loop is one that is controlled by an integer that counts up from a initial value to an upper limit. Such a loop is called a counting loop. The integer is called a loop control variable. The test must end the loop on the correct count. ...

What type of loop is ideal if you want the loop to iterate at least once?

The do-while loop is ideal in situations where you always want the loop to iterate at least once.

What is the principal difference between a for next loop and a do loop loop?

Do-Loop construct is used when we don?t know how many iterations will be performed. When we know the exact number of execution on the block of code, For-Next construct is used. To use this construct we have to use a counter. We will always loop from star value to some end value.