CSC1208: OOP Techniques - JAVA Lecture 2 Spring 2024
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Questions and Answers

What is the purpose of adding braces {} after an if statement?

  • To create a new code block for variable declarations
  • To force the else clause to match the correct if clause (correct)
  • To indicate the end of the if statement
  • To increase the readability of the code

    • What type of error is caused by adding a semicolon at the end of an if clause?

  • Compilation error
  • Logic error (correct)
  • Syntax error
  • Runtime error

    • Which logical operator is used to negate a boolean expression?

  • ^
  • ! (correct)
  • &&
  • ||

    • Given the expression (age > 18) && (weight > 140), what would be the result if age is 24 and weight is 140?

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

    Which logical operator is used to represent the exclusive or operation?

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

    What is the purpose of using the next-line block style for if statements?

    <p>To improve code readability</p> Signup and view all the answers

    What is a requirement for the switch-expression in a switch statement?

    <p>Must be of type char, byte, short, or int</p> Signup and view all the answers

    When comparing a case value to the switch-expression, what is required about the data types?

    <p>They must match the data type of the switch-expression</p> Signup and view all the answers

    In a switch statement, what happens if the break statement is not included in a case?

    <p>The next case will be executed</p> Signup and view all the answers

    What is the purpose of the default case in a switch statement?

    <p>To execute when none of the specified cases matches</p> Signup and view all the answers

    Which of the following is NOT a valid data type for the switch-expression in a switch statement?

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

    What are the resulting statements in a case statement executed based on in a switch statement?

    <p>When the value in the case statement matches the switch-expression value</p> Signup and view all the answers

    What is the default value of a boolean data type in Java?

    <p>'false'</p> Signup and view all the answers

    In Java, what is the default size of a double data type?

    <p>8 bytes</p> Signup and view all the answers

    What is the output of the program execution shown in the code snippet?

    <p>'The area for the circle of radius 20 is 1256.636'</p> Signup and view all the answers

    What will be the value of 'area' if 'radius' is assigned a value of 10 in the program execution?

    <p>62.8309</p> Signup and view all the answers

    Which statement is correct regarding Java input and output devices?

    <p>Java uses System.in for standard input and System.out for standard output.</p> Signup and view all the answers

    What is the default value of a char data type in Java?

    <p>'\u0000'</p> Signup and view all the answers

    If 'radius' in the program execution is set to 0, what will be the value of 'area'?

    <p>-0.0</p> Signup and view all the answers

    'int' data type in Java occupies how many bytes by default?

    <p>4 bytes</p> Signup and view all the answers

    'float' data type in Java occupies how many bytes by default?

    <p>-4 bytes</p> Signup and view all the answers

    'long' data type in Java occupies how many bytes by default?

    <p>-8 bytes</p> Signup and view all the answers

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