Latest C++ Interview Questions and Answers Part-3
Inline follows strict parameter type checking, macros do not.
Macros are always expanded by preprocessor, whereas compiler may or may not replace the inline definitions.
22. How variable declaration in c++ differs that in c?
C requires all the variables to be declared at the beginning of a scope but in c++ we can declare variables anywhere in the scope. This makes the programmer easier to understand because the variables are declared in the context of their use.
23. What is multiple inheritance?
A class can inherit properties from more than one class which is known as multiple inheritance.
24. what is the use of virtual destructor in c++?
A destructor is automatically called when the object is destroyed.
A virtual destructor in C++ is used primarily to prevent resource leaks by performing a clean-up of the object.
25. What do you mean by reference variable in c++?
A reference variable provides an alias to a previously defined variable.
Data -type & reference-name = variable name
26. What is iterator class?
Iterator class provides an access to the class which are inside the containers(it holds a group of objects in an organized way).
The containers include the data structure, class and abstract data type.
27. What are the types of declarations in C++?
There are so many types of declaration in C++ are :
28. What are Smart pointers?
Smart pointers are almost similar to pointers with additional features such as automatic destruction of a variable when it becomes out of scope and the throwing of exceptions that ensures the proper destruction of the dynamically allocated objects.
29. Explain function template?
Function template provides a means to write generic functions for different data types such as integer, long, float or user defined objects.
30. Explain class template?
Class template provides a means to write a generic class for different types so that a class can have members based on generic types that do not need to be defined at the moment of creating the class or whose members use these generic types.