Java Ch 4 Quiz

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Quizzes Created: 38 | Total Attempts: 30,613
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Java Ch 4 Quiz - Quiz

Questions and Answers
  • 1. 

    True or False: The == operator is used to assign a value to a variable.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The == operator is not used to assign a value to a variable. It is used to compare two values and check if they are equal. The assignment operator (=) is used to assign a value to a variable.

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  • 2. 

    The operator || is the logical operator ____.

    Correct Answer
    OR
    or
    Or
    Explanation
    The operator || is the logical operator used for the OR operation. It returns true if either of the operands is true, and false if both operands are false. The answer "OR" is correct because it correctly identifies the logical operator represented by the symbol ||. The answers "or" and "Or" are also correct as they represent the same logical operator in different case formats.

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  • 3. 

    True or False: A relational operator allows you to make comparisons in a program.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    A relational operator is a programming construct that allows for comparisons to be made between two values. It evaluates the relationship between the values and returns a boolean result, either true or false, based on the comparison. Therefore, it is correct to say that a relational operator allows you to make comparisons in a program.

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  • 4. 

    What is the value of the expression:  (10 >= 5) && (‘B’ < ‘C’)

    Correct Answer
    true
    True
    Explanation
    The expression (10 >= 5) evaluates to true because 10 is greater than or equal to 5. The expression ('B' < 'C') also evaluates to true because 'B' comes before 'C' in alphabetical order. The && operator combines the two expressions and returns true only if both expressions are true. Since both expressions are true, the overall value of the expression is true.

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  • 5. 

    With short-circuit evaluation, when the value of an entire expression is found, evaluation ____.

    Correct Answer
    stops
    Explanation
    With short-circuit evaluation, when the value of an entire expression is found, evaluation stops. This means that if a condition in the expression is already determined to be true or false, the evaluation of the remaining conditions is skipped. This is because the final result of the expression is already known and there is no need to continue evaluating the remaining conditions. This can improve the efficiency of the program by avoiding unnecessary evaluations.

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  • 6. 

    A(n) ____ is sometimes referred to as a decision maker because it decides whether to execute the statement that follows it.

    Correct Answer
    expression
    Explanation
    An expression is sometimes referred to as a decision maker because it evaluates a condition and determines whether to execute the statement that follows it. If the condition is true, the expression will result in a value that allows the statement to be executed. However, if the condition is false, the expression will result in a different value that prevents the statement from being executed. Therefore, the expression acts as a decision maker in determining the flow of the program based on the condition being evaluated.

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  • 7. 

    True or False: An if statement must be followed by an else statement.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    An if statement does not necessarily have to be followed by an else statement. In programming, an if statement is used to execute a block of code if a certain condition is true. However, it is not mandatory to have an else statement after an if statement. The else statement is used to specify a block of code to be executed if the condition in the if statement is false. Therefore, it is possible to have an if statement without an else statement.

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  • 8. 

    When one control statement is located within another, it is said to be ____.

    Correct Answer
    nested
    Explanation
    When one control statement is located within another control statement, it is said to be "nested". This means that the inner control statement is contained within the outer control statement, creating a hierarchical structure. The inner control statement will only be executed if the conditions of both the outer and inner control statements are satisfied. This nesting of control statements allows for more complex and specific conditions to be evaluated and executed in a program.

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  • 9. 

    The statement following an expression is sometimes called the ____ statement.

    Correct Answer
    action
    Explanation
    The statement following an expression is sometimes called the "action" statement. This is because the statement represents the action or operation that should be performed based on the expression's result. It is the next step or instruction that should be executed in the program flow.

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  • 10. 

    True or False: An else statement must be paired with an if statement.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    An else statement must be paired with an if statement because it provides an alternative action to be executed if the condition in the if statement evaluates to false. The else statement is used to handle all other cases that are not covered by the if statement, ensuring that there is always a code block to be executed regardless of the condition's outcome.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 12, 2011
    Quiz Created by
    Tcarteronw
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