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?

    <p>To repeat an operation at least once and then only if a condition is true</p> 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?

    <p>While loop</p> Signup and view all the answers

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

    <p>While loop</p> Signup and view all the answers

    What does the for loop control in Java?

    <p>Number of times an operation is repeated</p> Signup and view all the answers

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

    <p>Sequence</p> Signup and view all the answers

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

    <p>To repeat an operation while a condition remains true</p> Signup and view all the answers

    What does the selection control structure allow for?

    <p>Alternative course of actions</p> Signup and view all the answers

    What is the purpose of a while loop in pseudocode?

    <p>To repeat one or more statements as long as a specified condition remains true</p> Signup and view all the answers

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

    <p>The loop body is never executed</p> Signup and view all the answers

    What is the purpose of a counter in a loop?

    <p>To count how many repetitions have been made</p> Signup and view all the answers

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

    <p>Within the loop body</p> Signup and view all the answers

    When is the control condition in a while loop tested?

    <p>Before any statement in the loop is executed</p> Signup and view all the answers

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

    <p>The loop body is executed</p> Signup and view all the answers

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

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

    What is used to declare a variable in pseudocode?

    <p>var keyword</p> Signup and view all the answers

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

    <p>Before testing the control condition</p> 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.

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