Question 1

____ loops should be used only when their instructions must be processed at least once.
A) Posttest
B) Pretest
C) DoAfter
D) ProcessAfter

Accepted Answer

Posttest loops, such as the "do-while" loop in many programming languages, ensure that the loop's body is executed at least once before the condition is tested. This is because the condition check occurs after the body of the loop has been executed.

Question 2

In the posttest syntax, the condition is evaluated before the loop instructions are processed.

Accepted Answer

In the posttest loop syntax (e.g., do-while loop), the condition is evaluated after the loop instructions are processed, not before.

Question 3

In the pretest syntax, the condition is evaluated after the loop instructions are processed.

Accepted Answer

In the pretest loop syntax, the condition is evaluated before the loop instructions are processed, determining whether the loop will execute.

Question 4

The ____ loop condition is evaluated after the instructions within the loop are processed.
A) posttest
B) pretest
C) before
D) after

Accepted Answer

A posttest loop, such as a do-while loop in many programming languages, evaluates its condition after executing the loop's body, ensuring that the loop's instructions are processed at least once before any condition check.

Question 5

In the ____ loop, the condition appears in the last line.
A) sequential
B) pretest
C) posttest
D) iterative

Accepted Answer

In a posttest loop, also known as a do-while loop, the condition is evaluated after the body of the loop has executed, which means it appears at the end of the loop structure. This ensures that the loop body is executed at least once.

Question 6

The instructions in a pretest loop will be processed at least once.

Accepted Answer

In a pretest loop (also known as an entry-controlled loop), the condition is tested before the body of the loop is executed, so if the condition is false from the beginning, the instructions inside the loop will not be executed at all.

Question 7

The instructions in a posttest loop ____.
A) may never be processed
B) should only be processed once
C) always will be processed at least twice
D) always will be processed at least once

Accepted Answer

In a posttest loop, the instructions within the loop are executed at least once before the condition is tested. This ensures that the loop's body is processed at least once, regardless of whether the loop's condition is true or false at the first test.

Question 8

In the pretest syntax for a Do…Loop statement, the {While | Until} condition section is part of the ____ clause.
A) Execute
B) Process
C) Do
D) Loop

Accepted Answer

The {While | Until} condition in a pretest Do…Loop statement is part of the "Do" clause, specifying the condition at the beginning of the loop.

Question 9

Pretest loops should be used only when their instructions must be processed at least once.

Accepted Answer

Pretest loops (like the "while" loop) check the condition before executing the loop body, meaning they may not execute at all if the condition is false initially. Loops that execute at least once regardless of the initial condition are post-test loops (like the "do-while" loop).

Question 10

A pretest loop is easier to write and understand than a posttest loop with a selection structure.

Accepted Answer

A pretest loop checks the condition before executing the loop body, while a posttest loop executes the loop body before checking the condition. This makes a pretest loop easier to write and understand because the programmer can see the condition before writing the loop body.

Question 11

In the ____ loop, the condition appears in the first line.
A) sequential
B) pretest
C) posttest
D) iterative

Accepted Answer

In a pretest loop, such as a "for" or "while" loop, the condition is checked before the loop body is executed, ensuring that the loop runs only if the condition is true from the start.

Question 12

Most programmers use posttest loops.

Accepted Answer

Most programmers choose the type of loop (pretest like `for` and `while`, or posttest like `do-while`) based on the specific requirements of the situation rather than a general preference for one type.

Question 13

A repetition structure can be either a pretest loop or a posttest loop.

Accepted Answer

A repetition structure, also known as a loop, can indeed be categorized as either a pretest loop, where the condition is tested before the loop body is executed (e.g., while loop), or a posttest loop, where the condition is tested after the loop body has been executed at least once (e.g., do-while loop).

Question 14

The ____ loop condition is evaluated before the instructions within the loop are processed.
A) posttest
B) pretest
C) before
D) after

Accepted Answer

The pretest loop evaluates its condition before executing the loop's body, ensuring that the loop's instructions are only processed if the condition is true from the start.

Question 15

In the posttest syntax for a Do…Loop, the {While | Until} condition section is part of the ____ clause.
A) Execute
B) Process
C) Do
D) Loop

Accepted Answer

In the posttest syntax for a Do…Loop, the {While | Until} condition section is part of the Loop clause, which determines whether the loop continues to execute based on the specified condition.

Question 16

The Do…Loop statement can be used to code a pretest loop as well as a posttest loop.

Accepted Answer

The Do...Loop statement in programming languages like Visual Basic allows for both pretest loops, where the condition is tested before the loop body is executed (Do While...Loop), and posttest loops, where the condition is tested after the loop body is executed (Do...Loop While/Until), enabling it to handle a variety of looping scenarios.

Question 17

When a posttest loop is placed in a selection structure, the loop will be processed only when the selection structure's condition evaluates to True.

Accepted Answer

A posttest loop, such as a do-while loop, executes its block of code at least once and will continue to execute as long as the loop's condition is true. If placed within a selection structure, it will only execute if the selection condition is true.

Question 18

The diamond that represents the condition appears at the top of the loop in the flowchart of a posttest loop.

Accepted Answer

In a flowchart, the diamond that represents the condition appears at the bottom of the loop in a posttest loop, indicating that the condition is checked after the loop's body has executed.

Question 19

The difference between pretest and posttest loops pertains to how the accumulator is evaluated.

Accepted Answer

The difference between pretest and posttest loops pertains to when the condition is checked, not how an accumulator is evaluated. Pretest loops check the condition before executing the loop body, while posttest loops check the condition after executing the loop body.

Question 20

In the posttest syntax, the only purpose of the Do clause is to mark the beginning of the loop.

Accepted Answer

The Do clause in posttest syntax marks the start of the loop, indicating where the loop's instructions begin.

Quiz 13: Do It, Then Ask Permission Posttest Loops

____ loops should be used only when their instructions must be processed at least once.

In the posttest syntax, the condition is evaluated before the loop instructions are processed.

In the pretest syntax, the condition is evaluated after the loop instructions are processed.

The ____ loop condition is evaluated after the instructions within the loop are processed.

In the ____ loop, the condition appears in the last line.

The instructions in a pretest loop will be processed at least once.

The instructions in a posttest loop ____.

In the pretest syntax for a Do…Loop statement, the {While | Until} condition section is part of the ____ clause.