Java Iterative Control Statements Quiz

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Questions and Answers

Which of the following control structures allows for alternative course of actions?

Sequence

While loop

Repetition/Iteration

Selection (correct)

What is the purpose of a loop in Java?

To perform alternative course of actions

To execute instructions in the order they appear

To select sections of code within the program

To control how many times an operation is repeated (correct)

Which type of repetition structure is used when the number of repetitions is known?

Do-while loop

While loop

Selection structure

For loop (correct)

What is the main purpose of a do-while loop?

To repeat an operation at least once and then only if a condition is true (C) Signup and view all the answers

Which control structure is used to specify that an action is to be repeated while some condition remains true?

While loop (C) Signup and view all the answers

What type of loop structure is generally used when the number of repetitions is unknown?

While loop (A) Signup and view all the answers

What does the for loop control in Java?

Number of times an operation is repeated (C) Signup and view all the answers

Which type of control structure allows for executing instructions line after line?

Sequence (D) Signup and view all the answers

What is the main purpose of a while loop in Java?

To repeat an operation while a condition remains true (A) Signup and view all the answers

What does the selection control structure allow for?

Alternative course of actions (B) Signup and view all the answers

What is the purpose of a while loop in pseudocode?

To repeat one or more statements as long as a specified condition remains true (D) Signup and view all the answers

What happens if the control condition in a while loop is false?

The loop body is never executed (C) Signup and view all the answers

What is the purpose of a counter in a loop?

To count how many repetitions have been made (D) Signup and view all the answers

Where are the statements to be repeated located in a while loop?

Within the loop body (A) Signup and view all the answers

When is the control condition in a while loop tested?

Before any statement in the loop is executed (C) Signup and view all the answers

What happens if the control condition in a while loop is True?

The loop body is executed (A) Signup and view all the answers

In pseudocode, what is used to add 1 to a counter?

<ul> <li>operator (C)</li> </ul> Signup and view all the answers

What is used to declare a variable in pseudocode?

var keyword (B) Signup and view all the answers

Where should the increment operation be placed in a while loop?

Before testing the control condition (D) Signup and view all the answers

Study Notes

Control Structures in Java

Selection Control Structures: Allow for alternative courses of action based on conditions. This is achieved through if, else if, and else statements.
Repetition (Loop) Structures: Enable the repeated execution of a block of code. There are several types, each suited for different scenarios:
- for loop: Used when the number of repetitions is known in advance. It controls the loop using an initialization, a condition, and an increment/decrement statement.
- while loop: Used when the number of repetitions is unknown. The loop continues as long as a specified condition remains true. The condition is evaluated before each iteration.
- do-while loop: Similar to the while loop, but the condition is checked after each iteration. This guarantees at least one execution of the loop body.

Loop Functionality

Loop Purpose: To repeatedly execute a set of instructions until a certain condition is met.
Counter in a Loop: A variable used to keep track of the number of iterations. It's typically incremented (or decremented) within the loop.
while Loop Structure: The statements to be repeated are placed inside the body of the while loop, which is enclosed within curly braces {}.
while Loop Condition: The control condition is tested at the beginning of each iteration.
while Loop Execution: If the control condition is true, the loop body is executed. If false, the loop terminates.
Incrementing a Counter: In pseudocode, counter = counter + 1 or counter += 1 adds 1 to a counter.

Pseudocode and Variable Declaration

Pseudocode Variable Declaration: Variables are typically declared using a statement like DECLARE variableName. The specific syntax can vary depending on the pseudocode style used.
Increment Operation Placement: The increment operation should be placed inside the while loop body, usually at the end, to ensure proper iteration.

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Description

Test your knowledge of iterative control statements such as while, do-while, and for loops in Java. This quiz also covers the concept of control structures and the order in which instructions are carried out in a Java program.