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.

Questions and Answers

Answer : B

Explaination

It is sufficient to have one pure virtual function in the class to make it as an abstract class.

Q 2 - Which operator is required to be overloaded as member function only?

A - _

B - _ _

C - ++ (postfix version)

D - =

Answer : D

Explaination

Overloaded assignment operator does the job similar to copy constructor and is required to be overloaded as member function of the class.

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

A - True

B - False

Answer : A

Explaination

Q 4 - What is the output of the following program?

#include<iostream>

using namespace std;
class Base {
public: 
   virtual void f() { 
      cout<<"Base\n";
   }
};

class Derived:public Base {
public: 
   void f() { 
      cout<<"Derived\n";
   }
};

main() { 
   Base *p = new Derived();
   p->f();

}

A - Base

B - Derived

C - Compile error

D - None of the above.

Answer : B

Explaination

The overridden method f() of the created object for derived class gets called.

#include<iostream>

using namespace std;
class Base {
public: 
   virtual void f() { 
      cout<<"Base\n";
   }
};

class Derived:public Base {
public: 
   void f() { 
      cout<<"Derived\n";
   }
};

main() { 
   Base *p = new Derived();
   p->f();

}

Q 5 - What is the output of the following program?

#include<iostream>

using namespace std;
main() { 
   int *p = new int; 
   delete p; 
   delete p; 
   cout<<"Done";
}

A - Done

B - Compile error

C - Runtime error

D - None of the above

Answer : C

Explaination

It is invalid to release memory more than once.

#include<iostream>

using namespace std;
main() { 
   int *p = new int; 
   delete p; 
   delete p; 
   cout<<"Done";
}

Answer : C

Explaination

A constructor cant be overridden.

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

#include <iostream>
using namespace std;
 
int main () {
   // local variable declaration:
   int x = 1;

   switch(x) {
   case 1 :
      cout << "Hi!" << endl; 
      break;
   default :
      cout << "Hello!" << endl;
   }
}

A - Hello

B - Hi

C - HelloHi

D - Compile error

Answer : B

Explaination

Hi, control reaches default-case after comparing the rest of case constants.

#include <iostream>
using namespace std;
 
int main () {
   // local variable declaration:
   int x = 1;

   switch(x) {
   case 1 :
      cout << "Hi!" << endl; 
      break;
   default :
      cout << "Hello!" << endl;
   }
}

Q 8 - What is the output of the following program?

#include<iostream>

using namespace std;
main() { 
   int a[] = {1, 2}, *p = a;
   
   cout<<p[1]; 
}

A - 1

B - 2

C - Compile error

D - Runtime error

Answer : B

Explaination

as p holds the base address then we can access array using p just like with a

#include<iostream>

using namespace std;
main() { 
   int a[] = {1, 2}, *p = a;
   
   cout<<p[1]; 
}

Q 9 - Identify the C++ compiler of Linux

A - cpp

B - g++

C - Borland

D - vc++

Answer : B

Explaination

g++ is GNU C++ compiler for linux. Borland and vc++ (Microsoft visual c++) for windows.

Q 10 - i) Exceptions can be traced and controlled using conditional statements.

ii) For critical exceptions compiler provides the handler

A - Only (i) is true

B - Only (ii) is true

C - Both (i) & (ii) are true

D - Both (i) && (ii) are false

Answer : B

Explaination

Conditional statements are used to take alternate actions depending upon certain condition but not multi branching. C++ too provides some critical exception handlers.

cpp_questions_answers.htm
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