C++ Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to C++ Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - What is the output of the following program?

#include<iostream>

using namespace std;
class abc { 
   void f();
   void g();
   int x;
};

main() {
   cout<<sizeof(abc)<<endl;
}

A - 12

B - 4

C - 8

D - Compile error

Answer : B

Explaination

Only the class member variables constitutes as the size of the class or its object.

#include<iostream>

using namespace std;
class abc { 
   void f();
   void g();
   int x;
};
main() {
   cout<<sizeof(abc)<<endl;
}

Q 2 - The operator used to access member function of a structure using its object.

A - .

B - ->

C - *

D - None of the above.

Answer : A

Explaination

Just the way we use dot (.) operator to access members of the class, in similar it is used to access the members of the structure too.

Q 3 - We can have varying number of arguments for the overloaded form of () operator.

A - True

B - False

Answer : A

Explaination

Q 5 - Which feature of the OOPS gives the concept of reusability?

A - Abstraction

B - Encapsulation

C - Inheritance

D - None of the above.

Answer : C

Explaination

The process of designing a new class (derived) from the existing (base) class to acquire the attributes of the existing is called as inheritance. Inheritance gives the concept of reusability for code/software components.

Q 6 - A C++ program statements can be commented using

A - Single line comment

B - Multi line comment

C - Either (a) or (b)

D - Both (a) and (b).

Answer : D

Explaination

Both styles of commenting is available in C++.

Q 7 - What is the outpout of the following program?

#include<iostream>

using namespace std;
main() {
   enum { 
      india, is = 7, GREAT 
   };

   cout<<india<<" "<<GREAT;
}

A - 0 1

B - 0 2

C - 0 8

D - Compile error

Answer : C

Explaination

0 8, enums gives the sequence starting with 0. If assigned with a value the sequence continues from the assigned value.

#include<iostream>

using namespace std;
main() {
   enum { 
      india, is = 7, GREAT 
   };

   cout<<india<<" "<<GREAT;
}

Q 8 - What is the size of the following union definition?

#include<iostream>

using namespace std;
main() {
   union abc { 
      char a, b, c, d, e, f, g, h; 
      
      int i;
   };
   cout<<sizeof(abc);
}

A - 1

B - 2

C - 4

D - 8

Answer : C

Explaination

union size is biggest element size of it. All the elements of the union share common memory.

#include<iostream>

using namespace std;
main() {
   union abc { 
      char a, b, c, d, e, f, g, h; 
      
      int i;
   };
   cout<<sizeof(abc);
}

Q 9 - What is the output of the following program?

main() {
}

A - No output

B - Garbage

C - Compile error

D - Runtime error

Answer : A

Explaination

It is valid to have main() function empty, therefore producing no displayable output.

Q 10 - What is the output of the following program?

#include<iostream>

using namespace std;
void main() {
   char s[] = "C++";
   
	cout<<s<<" ";
	s++;
	cout<<s<<" ";
}

A - C++ C++

B - C++ ++

C - ++ ++

D - Compile error

Answer : D

Explaination

ā€˜sā€™ refers to a constant address and cannot be incremented.

#include<iostream>

using namespace std;
void main() {
   char s[] = "C++";
   
	cout<<s<<" ";
	s++;
	cout<<s<<" ";
}
cpp_questions_answers.htm
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