Java Control Structures Quiz
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Questions and Answers

What are the three main control structures in any programming language?

  • If, If/Else, Else/If
  • Sequence, Selection, Iteration (correct)
  • If, Else, Switch
  • For, While, Do/While

    • Which control structure is used to choose between alternative courses of action in a Java program?

  • while
  • if (correct)
  • do/while
  • for

    • In a selection structure, what follows the keyword 'if'?

  • An expression in parentheses (correct)
  • A variable declaration
  • A loop condition
  • A sequence of statements

    • What is the purpose of the 'else' statement in the 'if/else' selection structure?

    <p>To execute when the 'if' condition is false</p> Signup and view all the answers

    Which control structure is used for executing instructions repeatedly until a logical condition is satisfied?

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

    In a Java program, what determines the price of a cinema ticket based on the user's age?

    <p>'if' selection structure</p> Signup and view all the answers

    What is the syntax of the if statement in Java?

    <p>if (expression) statement;</p> Signup and view all the answers

    Which operator is used to check if a value is greater than or equal to another value in Java?

    <p>&gt;=</p> Signup and view all the answers

    What does the following code do in Java? if(length == width) { System.out.print("it is square"); }

    <p>Prints 'it is square' if length is equal to width</p> Signup and view all the answers

    What would be the output of the following code in Java? if(hrsWked > 38) { System.out.print("Overtime hours: " +(hrsWked - 38)); }

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

    What is the purpose of indentation in the if statement?

    <p>To indicate the block of code that should be executed if the condition is true</p> Signup and view all the answers

    What happens if the expression in an if statement is false?

    <p>The statements following the if are not executed</p> Signup and view all the answers

    What does the following code do in Java? if(totalPrice >= 100) { disc = totalPrice *.1; totalPrice = totalPrice - disc; }

    <p>Applies a 10% discount if totalPrice is more than or equal to €100</p> Signup and view all the answers

    What type of comparison does the operator '==' represent in Java?

    <p>Not equal to</p> Signup and view all the answers

    What would be the output of the following code in Java? if(balance > 0) { fee = 0; }

    <p>'fee' is assigned a value of 0 if 'balance' is greater than 0</p> Signup and view all the answers

    What does the operator '>=' represent in Java?

    <p>'≥' Greater than or equal to</p> Signup and view all the answers

    Study Notes

    Control Structures in Java

    • The three main control structures in any programming language are selection, repetition, and sequence.

    Selection Structures

    • Selection structures are used to choose between alternative courses of action in a Java program.
    • The keyword 'if' is used in selection structures, followed by a boolean expression.
    • The 'else' statement is used in the 'if/else' selection structure to specify an alternative course of action when the condition is false.

    If Statement in Java

    • The syntax of the if statement in Java is if (boolean expression) { statements }.
    • The &gt;= operator is used to check if a value is greater than or equal to another value in Java.
    • The == operator represents equality comparison in Java, checking if two values are equal.

    If Statement Examples

    • if (length == width) { System.out.print("it is square"); }: This code checks if the length is equal to the width, and prints "it is square" if true.
    • if (hrsWked &gt; 38) { System.out.print("Overtime hours: " + (hrsWked - 38)); }: This code checks if the hours worked is greater than 38, and prints the overtime hours if true.
    • if (totalPrice &gt;= 100) { disc = totalPrice *.1; totalPrice = totalPrice - disc; }: This code checks if the total price is greater than or equal to 100, and applies a 10% discount if true.
    • if (balance &gt; 0) { fee = 0; }: This code checks if the balance is greater than 0, and sets the fee to 0 if true.

    If Statement Rules

    • Indentation is used to denote the block of code within the if statement.
    • If the expression in an if statement is false, the code within the if block is skipped.
    • The &gt;= operator represents "greater than or equal to" in Java.

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    Related Documents

    Week 3 If Control Structure.pdf

    Description

    Test your knowledge of Java control structures with this quiz. Learn about sequence, selection, and repetition/iteration in Java programming, including if, if/else, switch, for, while, and do/while statements.

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