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

Why use a constructor in a C++ class?

1. To allocate memory for the class objects

2. For mandatory function overloading

3. To ensure that objects are initialized when created

4. Constructors are not necessary in C++

The correct answer is: To ensure that objects are initialized when created

Using a constructor in a C++ class is important because it ensures that objects are properly initialized when they are created. This helps prevent any errors or bugs in the code and ensures that the object is in a valid state. Option A is incorrect because memory can also be allocated for class objects using a default constructor, which does not need to be explicitly defined. Option B is incorrect because function overloading is not a mandatory requirement for constructors in C++. Option D is incorrect because constructors are necessary in C++ as they are used to initialize objects and set their initial values.