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C++ 9th Edition: Chapter 5 - Increment and Decrement Operators Quiz

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C++ 9th Edition: Chapter 5 - Increment and Decrement Operators Quiz

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Questions and Answers

What is the difference between the prefix and postfix increment operators?

The prefix operator (++val) increments the value by 2, while the postfix operator (val++) increments the value by 1.

In prefix mode (++val), the operator returns the original value, then increments the variable. In postfix mode (val++), the operator increments the value of the variable first, then returns the incremented value.

Prefix and postfix operators behave the same way; there is no difference between them.

In prefix mode (++val), the operator increments the value of the variable first, then returns the incremented value. In postfix mode (val++), the operator returns the original value, then increments the variable. (correct)

Which of the following statements is equivalent to `val = val + 1`?

Neither (a) nor (b)

val++;

Both (a) and (b) (correct)

++val;

In the expression `cout << ++val << val++;`, what is the output if the initial value of `val` is 5?

5 5

5 6

6 5 (correct)

6 6

What is the output of the following code snippet?

int x = 10;
cout &lt;&lt; x++ &lt;&lt; ' ' &lt;&lt; ++x;

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Which operator is used to decrement the value of a variable by 1?

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What is the output of the following code snippet?

int a = 5, b = 10;
a = a++ + ++b;
cout &lt;&lt; a &lt;&lt; ' ' &lt;&lt; b;

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Study Notes

Increment and Decrement Operators

The increment operator is ++, which adds one to a variable.
val++; is equivalent to val = val + 1;
The increment operator can be used in two ways:
- Prefix: ++val; (increments the variable, then returns the value)
- Postfix: val++; (returns the value of the variable, then increments)

Decrement Operator

The decrement operator is --, which subtracts one from a variable.
val--; is equivalent to val = val - 1;
The decrement operator can also be used in two ways:
- Prefix: --val; (decrements the variable, then returns the value)
- Postfix: val--; (returns the value of the variable, then decrements)

Using Increment and Decrement Operators in Programs

Increment and decrement operators can be used in complex statements and expressions.
It is important to understand the difference between prefix and postfix operators to avoid unexpected results.

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Description

Test your knowledge on the increment and decrement operators in C++ with this quiz based on Chapter 5 of the 'Starting Out with C++ 9th Edition' book. Understand how ++ and -- operators work as both prefix and postfix. Copyright © 2019, 2016, 2012 Pearson Education, Inc.