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

What problem does default argument feature solve?

1. It allows functions to return multiple types

2. It makes function calls more convenient when most arguments have standard values

3. It enables functions to operate polymorphically

4. It reduces the need for function overloading

The correct answer is: It makes function calls more convenient when most arguments have standard values

The default argument feature allows users to specify default values for function parameters. This means that when a function is called, if the argument for a parameter is not provided, the default value will be used instead. This makes it more convenient to call the function, especially when there are multiple parameters and most of them have standard values. Option A is incorrect because returning multiple types is not the purpose of default arguments. Option C is incorrect because polymorphism refers to the ability of objects to have many different behaviors depending on their data types, which is not related to default arguments. Option D is incorrect because function overloading is used when there are multiple functions with the same name but different parameters, which is not related to default arguments.