What is inheritance in C++?The process of defining a new class based on an existing class.The process of defining a new function in an existing class.The process of converting one data type to another.The process of destroying an object.

Inheritance in C++ is the process of defining a new class based on an existing class. This is a fundamental concept in object-oriented programming where a new class is derived from an existing one. The new class, known as the derived class, inherits the members of the class it is based on, known as the base class. This allows for code reusability and the ability to add new features to existing code without modifying it.

The other options mentioned are not related to inheritance. Defining a new function in an existing class is a part of class functionality, not inheritance. Converting one data type to another is known as type casting. Destroying an object refers to the process of deallocating memory that was previously allocated to an object, which is done using the destructor in C++.

Inheritance in C++ is the process of defining a new class based on an existing class. This is a fundamental principle of Object-Oriented Programming (OOP). It allows for code reusability and the creation of more complex objects by building upon simpler ones.

Here's a step-by-step explanation:

1. Define a Base Class: This is the existing class that will serve as the foundation for inheritance. It contains attributes and methods that will be inherited by the derived class.

class BaseClass {
public:
    void baseFunction() {
        // code
    }
};

2. Define a Derived Class: This is the new class that is based on the existing class. It inherits all the public and protected members of the base class.

class DerivedClass : public BaseClass {
public:
    void derivedFunction() {
        // code
    }
};

3. Use the Derived Class: You can now create objects of the derived class and use both the methods from the base class and the derived class.

int main() {
    DerivedClass obj;
    obj.baseFunction(); // inherited from BaseClass
    obj.derivedFunction(); // defined in DerivedClass
    return 0;
}

In this way, inheritance allows us to build upon existing classes and create more complex functionality while reusing code.