Onward Technologies Inc Software Engineer Interview Questions and Answers

Data storage classes in C++

• C++ provides several data storage classes, including 'auto', 'register', 'static', 'extern', and 'mutable'.

• The 'auto' storage class is the default and is used for local variables.

• The 'register' storage class is used to define local variables that should be stored in CPU registers for faster access.

• The 'static' storage class is used for variables that retain their values across function calls.

• ...read more

OOP's concepts include encapsulation, inheritance, and polymorphism.

• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes from existing ones, inheriting their properties and behaviors.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Example: A class 'Car' encapsulates data like 'color' and methods like 'startEngine'.

• Example: Class 'SUV'...read more

Static polymorphism is resolved at compile-time, while runtime polymorphism is resolved at runtime.

• Static polymorphism is achieved through function overloading and operator overloading.

• Runtime polymorphism is achieved through virtual functions and function overriding.

• Static polymorphism is faster as it is resolved at compile-time, while runtime polymorphism incurs overhead at runtime.

• Static polymorphism is also known a...read more

Smart pointers are objects that manage the lifetime of dynamically allocated memory in C++.

• Smart pointers automatically deallocate memory when it is no longer needed.

• They prevent memory leaks and dangling pointers.

• Examples of smart pointers in C++ are unique_ptr, shared_ptr, and weak_ptr.

New and delete operators are used for dynamic memory allocation in C++.

• New operator is used to allocate memory dynamically for an object or an array.

• Delete operator is used to deallocate the memory allocated by new operator.

• New operator returns a pointer to the allocated memory.

• Delete operator takes a pointer to the memory to be deallocated.

• If delete is called on a null pointer, no action is taken.

Programs related to class and OOP

• Create a class with attributes and methods

• Implement inheritance and polymorphism

• Use encapsulation to hide data

• Demonstrate the concept of abstraction

• Create objects and call their methods