Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++'

What does operator overloading in C++ allow the programmer to do?

1. Change the evaluation precedence of operators

2. Define new meanings for existing operators when used with user-defined types

3. Combine operators that have no predefined meanings in C or C++

4. Alter the fundamental operations of built-in data types

The correct answer is: Define new meanings for existing operators when used with user-defined types

Operator overloading in C++ allows the programmer to define new meanings for existing operators when used with user-defined types. Unlike option A, changing the evaluation precedence of operators is done with parentheses and is not related to operator overloading. Option C is incorrect because operator overloading does not combine operators, but rather gives new meanings to existing ones. Finally, option D is incorrect because operator overloading only applies to user-defined types, not built-in data types. Therefore, option B is the correct choice as it accurately represents what operator overloading does in C++.