Here, are some sample questions based on "C++/OOPS Programming language". Read it carefully as these questions will help you in cracking any interview.
41) How is operator overloading implemented successfully in C++?
Answer: In C++, operator overloading follows the same procedure of functioning as function overloading. The implementation of operator overloading depends upon the situation where the operator is used. For example, the ‘-‘sign, when used with a number, like -20, is read by the compiler to be a negative number. At the same time, when the ‘-‘ sign is associated with two numbers, like 8-5, then the compiler identifies it to be the subtraction operation.
42) What is abstract class?
Answer: Abstract class is a class that defines an interface, but does not necessarily provide implementations for all its member functions. No objects of an abstract class exist, i.e, it cannot be instantiated.
43) What is concrete class?
Answer: A concrete class is a derived class of an abstract class that implements all the missing functionality. A concrete class can be instantiated. i.e, its objects can be created.
44) What is function overloading and operator overloading?
Answer: A function name having several definitions that are differentiable by the number or types of their arguments is known as function overloading.
Operator overloading is a specific case of polymorphism in C++. In operator overloading, different operators have different implementations, depending on their arguments.
45) What is a ‘friend’ function?
Answer: A friend function in C++ is a function which allows access to private or protected data in a class from outside. Friend functions are declared using the ‘friend’ keyword.
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