C++ Object-oriented
C++ Overloading
C++ Polymorphism
C++ Abstraction
C++ Encapsulation
C++ Interfaces
C++ Virtual Function
C++ Pure Virtual Functions & Abstract Classes
C++ Override Specifiers
C++ Final Specifiers

C++ Online Quiz

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.

Q 1 - Choose the operator which cannot be overloaded.

Answer : C

Explaination

Scope resolution (::) is not permitted to be overloaded.

Q 2 - Choose the respective delete operator usage for the expression ptr=new int[100].

Answer : C

Explaination

Q 3 - Pick up the valid declaration for overloading ++ in postfix form where T is the class name.

A - T operator++();

B - T operator++(int);

C - T& operator++();

D - T& operator++(int);

Answer : B

Explaination

The parameter int is just to signify that it is the postfix form overloaded. Shouldnt return reference as per its original behavior.

Q 4 - Escape sequence character '\0' occupies __ amount of memory.

Answer : B

Explaination

As it is also a character is occupies 1 byte of memory.

Q 5 - The programs machine instructions are store in __ memory segment.

Answer : D

Explaination

Code segments holds the program instructions and fetched by instruction pointer for execution.

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;
}

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);
}

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() {
}

Answer : A

Explaination

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

Q 10 - Does both the loops in the following programs prints the correct string length?

#include<iostream>

using namespace std;
main() {
   int i;
   
   char s[] = "hello";

   for(i=0; s[i]; ++i);
      cout<<i<<endl;

   i=0; 
   
   while(s[i++]);
      cout<<i;
}

A - Yes, both the loops prints the correct length

B - Only for loop prints the correct length

C - Only while loop prints the correct length

D - Compile error in the program.

Answer : B

Explaination

In while loop 'i' gets incremented after checking for '\0', hence giving 1 more than the length.

#include<iostream>

using namespace std;
main() {
   int i;
   
   char s[] = "hello";

   for(i=0; s[i]; ++i);
      cout<<i<<endl;

   i=0;
   
   while(s[i++]);
      cout<<i;
}

cpp_questions_answers.htm