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

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

#include<iostream>

using namespace std;
class abc { 
   public: 
      static int x; 
      int i; 

      abc() {
         i = ++x;
      }
   };
int abc::x;

main() { 
   abc m, n, p;
   
   cout<<m.x<<" "<<m.i<<endl;
}

A - 3 1

B - 3 3

C - 1 1

D - 1 3

Answer : A

Explaination

The static member variable x shares common memory among all the objects created for the class.

#include<iostream>

using namespace std;
class abc { 
   public: 
      static int x; 
      int i; 

      abc() {
         i = ++x;
      }
   };
int abc::x;

main() { 
   abc m, n, p;
   
   cout<<m.x<<" "<<m.i<<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.

Answer : C

Explaination

Virtual functions gives the ability to override the functionality of base class into the derived class. Hence achieving dynamic/runtime polymorphism.

Answer : D

Explaination

Answer : A

Explaination

Answer : C

Explaination

A constructor cant be overridden.

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 output of the following program?

#include<iostream>

using namespace std;
main() { 
   float t = 2;
	
	switch(t) {
      case 2: cout<<Hi;
		default: cout<<"Hello";
	}
}

A - Hi

B - HiHello

C - Hello

D - Error

Answer : D

Explaination

Error, switch expression cant be float value

#include<iostream>

using namespace std;
main() { 
   float t = 2;
	
	switch(t) {
		case 2: cout<<Hi;
		default: cout<<"Hello";
	}
}

Q 9 - A single line comment in C++ language source code can begin with _____

A - ;

B - :

C - /*

D - //

Answer : D

Explaination

Two immediate forward slashes are used to comment a single line. A single can be commented by beginning with /* and should be terminated with */ , in general used for multi-line comments.

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

#include<iostream>
#include<string.h>

using namespace std;
main() { 
   char s[] = "Hello\0Hi";
   
   cout<<strlen(s)<<" "<<sizeof(s);
}

A - 5 9

B - 7 20

C - 5 20

D - 8 20

Answer : A

Explaination

Length of the string is count of character upto \0. sizeof reports the size of the array.

#include<iostream>
#include<string.h>

using namespace std;
main() { 
   char s[] = "Hello\0Hi";
   
   cout<<strlen(s)<<" "<<sizeof(s);
}
cpp_questions_answers.htm
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