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

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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++?

Subtracts one from a variable Signup and view all the answers

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

After returning the value Signup and view all the answers

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

val = val + 1 Signup and view all the answers

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

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

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

The value is decremented and then returned Signup and view all the answers

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

Adds one to a variable Signup and view all the answers

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

Adds one to 'val' Signup and view all the answers

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

After returning the value of the variable Signup and view all the answers

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

Subtracts one from 'val' Signup and view all the answers

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

'val' after incrementing Signup and view all the answers

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

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

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

'val--;' Signup and view all the answers