C++ is a programming language that is part of the Object Oriented Programming System. This language was developed by Bjarne Stroustrup in 1985.
It uses abstraction of data using a concept named 'classes', among other features, to allow object-oriented programming. The main purpose of C++ programming was to add object-oriented concepts to the already available C programming.
In today's time, Object Oriented Programming is considered as the best in programming. Programs written in the C++ programming language can be run on operating systems such as Unix, Linux, Windows, etc.
Check some important C++ questions answers, which will help you in interview and exams.
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Q 1.
Which looping process is best used when the number of iterations is known ?
Ans.
For loop
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Q 2.
Which keyword is used to define macros in C++ ?
Ans.
#define
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Q 3.
The concept of oops allows compiler to insert arguments in a function call if it is not specified ?
Ans.
Default arguments
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Q 4.
How many types of polymorphisms are supported by C++ ?
Ans.
Two main types of polymorphism are run-time and compile-time
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Q 5.
Which term correctly describes overloading of functions ?
Ans.
Ad-hoc polymorphism
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Q 6.
Which operator is overloaded for object cout ?
Ans.
<<
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Q 7.
Which concepts means waiting until runtime to determine which function to call ?
Ans.
Dynamic binding
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Q 8.
Which concepts is used to implement late binding ?
Ans.
Virtual function
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Q 9.
Object oriented programming employs __________ programming approach ?
Ans.
Bottom-up approach
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Q 10.
What happens if the base and derived class contains definition of a function with same prototype ?
Ans.
Base class object will call base class function and derived class object will call derived class function.
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Q 11.
Which header file includes definition of 'cin' and 'cout' ?
Ans.
iostream.h
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Q 12.
When a class is defined inside any function or block, it is called ?
Ans.
Local class
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Q 13.
_________ is the OOP feature and mechanism that binds together code and the data it manipulates, and keep both safe from outside world ?
Ans.
Data Encapsulation
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Q 14.
Classes in C++ are ?
Ans.
User defined data types
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Q 15.
Which keyword is used to catch an exception in the code block ?
Ans.
Try keyword
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Q 16.
Static variable declared in a class are also called ______ ?
Ans.
Class variable
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Q 17.
What is the correct syntax to declare a pure virtual function ?
Ans.
virtual void Display(void) = 0;
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Q 18.
True statements regarding inline functions ?
Ans.
It speeds up execution but increase the code size
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Q 19.
Which operators cannot be overloaded in C++?
Ans.
?: and . operator
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Q 20.
Which statements allows you to overload a function in C++ ?
Ans.
Type and number of arguments
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Q 21.
What is the default value of static variable ?
Ans.
Zero
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Q 22.
_______ are used to format the data display in C++ ?
Ans.
Manipulators
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Q 23.
The keyword 'void' is used to declare ?
Ans.
A member function that is defined in a subclass
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Q 24.
When 'struct' is used instead of the 'class' keyword, will anything change in the program ?
Ans.
Access is public by default
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Q 25.
What is the use of constructors in C++ ?
Ans.
Initialize objects
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Q 26.
Which is an invalid visibility label while inheriting a class ?
Ans.
Friend
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Q 27.
Turbo C++ library function can be used for ?
Ans.
Write text in a various of fonts and sizes and draw lines and circles
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Q 28.
In C++, what will happen if a class is not having any name ?
Ans.
It cannot have a constructor and destructor.
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Q 29.
Which keyword is used to overload an operator?
Ans.
Operator keyword
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Q 30.
Which of the following escape sequences represents a tab ?
Ans.
\t
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