C++ 9th Edition: Loops and Files, Increment and Decrement Operators
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Questions and Answers

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

  • It divides a variable by 2
  • It adds one to a variable (correct)
  • It subtracts one from a variable
  • It multiplies a variable by 2

    • Which of the following is equivalent to the expression 'val++'?

  • val = val - 1 (correct)
  • val--
  • val = val * 2
  • val = val + 1

    • In prefix mode (++val), what value does the operator return?

  • Value before incrementing
  • Value after incrementing (correct)
  • Value after decrementing
  • Value before decrementing

    • What does the decrement operator -- do in C++?

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

    In postfix mode (val++), when does the operator perform the increment?

    <p>After returning the value</p> Signup and view all the answers

    Which of the following is equivalent to the expression '++val'?

    <p>val = val + 1</p> Signup and view all the answers

    What is the key difference between prefix and postfix modes of ++ and -- operators?

    <p>Prefix mode returns the value before incrementing, postfix mode returns it after</p> Signup and view all the answers

    What happens if you use '--val' in a C++ statement?

    <p>The value is decremented and then returned</p> Signup and view all the answers

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

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

    How is 'val++;' interpreted in C++?

    <p>Adds one to 'val'</p> Signup and view all the answers

    In postfix mode (val++), when is the increment operation performed?

    <p>After returning the value of the variable</p> Signup and view all the answers

    What is the result of '--val;' in C++?

    <p>Subtracts one from 'val'</p> Signup and view all the answers

    When using '++val;' in C++, which value does the operator return?

    <p>'val' after incrementing</p> Signup and view all the answers

    How are prefix and postfix modes of ++ and -- operators different in C++?

    <p>Prefix mode first increments/decrements, then returns the value; postfix mode returns the value first, then increments/decrements</p> Signup and view all the answers

    What is the equivalent of 'val = val - 1;' in C++?

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

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