C++ 9th Edition: Chapter 5 - Loops and Files Quiz
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Questions and Answers

What does the increment operator ++ do in C++?

  • Subtracts one from a variable
  • Adds one to a variable (correct)
  • Multiplies a variable by one
  • Divides a variable by one
  • Which statement is equivalent to the expression 'val++'?

  • val += 1
  • val = val + 1 (correct)
  • val = val - 1
  • val -= 1
  • In which mode does the prefix increment operator return the value of the variable?

  • Prefix mode (correct)
  • Postfix mode
  • Both prefix and postfix modes
  • None of the above
  • What happens when you use the decrement operator -- in C++?

    <p>Subtracts one from a variable</p> Signup and view all the answers

    In which mode does the postfix decrement operator increment or decrement first, then return the value of the variable?

    <p>Postfix mode</p> Signup and view all the answers

    What would be the result of the statement 'int x = 5; cout << x++ + 5;' in C++?

    <p>11</p> Signup and view all the answers

    Which operator is used for decrementing a variable by one in C++?

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

    When using the postfix mode, what does 'val--' return before actually decrementing 'val'?

    <p>'val' remains unchanged</p> Signup and view all the answers

    In C++, when using the prefix mode for the increment operator, what does '++val' return?

    <p>The value of the variable after being incremented</p> Signup and view all the answers

    Which statement is equivalent to the expression 'val = val + 1;' in C++?

    <p>val++;</p> Signup and view all the answers

    When using the postfix mode for the decrement operator in C++, what does 'val--' return?

    <p>The value of the variable after being decremented</p> Signup and view all the answers

    What is the role of the increment operator '++' in C++?

    <p>Adds one to a variable</p> Signup and view all the answers

    Which mode of usage would return the value of a variable before incrementing it?

    <p>--val;</p> Signup and view all the answers

    In C++, what does '--val' do when used as a decrement operator?

    <p>Subtracts one from 'val' before returning its value</p> Signup and view all the answers

    If a variable 'num' has the value 5 in C++, what would be the result of 'num++ + 1;'?

    <p>5</p> Signup and view all the answers

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