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 : A

Explaination

As inline function gets expanded at the line of call like a macro it executes faster.

Q 2 - From the below class choose the proper definition of the member function f().

template <class T>

class abc {
   void f();
};

A - template <class T>

    void abc<T>::f() { }

B - template<class T>

    void abc::f() { }

C - template<T>

    void abc<class T>::f() { }

D - template<T>

    void abc<T>::f() { }

Answer : A

Explaination

Q 3 - What is the output of the following program?

#include<iostream>

using namespace std;
main() { 

   int i = 1, j = 2, k = 3, r; 

   r = (i, j, k);

   cout<<r<<endl;

}

A - 1

B - 2

C - 3

D - Compile Error

Answer : C

Explaination

Comma is called as the separator operator and the associativity is from left to right. Therefore k is the expressions resultant.

#include<iostream>

using namespace std;
main() { 

   int i = 1, j = 2, k = 3, r; 

   r = (i, j, k);

   cout<<r<<endl;

}

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

#include<iostream>

using namespace std;
class Base {
public:
   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 : A

Explaination

The method f() is not overridden therefore as per the pointer type respective method is called.

#include<iostream>

using namespace std;
class Base {
public:
   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;
class Base {
public:
   void f() { 
      cout<<"Base\n";
   }
};
class Derived:public Base {
public: 
   void f() {
      cout<<"Derived\n";
   };
};
main() { 
   Derived obj; 
   obj.Base::f();
}

A - Base

B - Derived

C - Compile error

D - None of the above.

Answer : A

Explaination

Base object cannot refer to Derived members.

#include<iostream>

using namespace std;
class Base {
public:
   void f() { 
      cout<<"Base\n";
  }
};
class Derived:public Base {
public: 
   void f() {
      cout<<"Derived\n";
   };
};
main() { 
   Derived obj; 
   obj.Base::f();
}

Q 6 - Which type of data file is analogous to an audio cassette tape?

A - Random access file

B - Sequential access file

C - Binary file

D - Source code file

Answer : B

Explaination

As the access is linear.

Answer : A

Explaination

When the program is in execution phase the possible unavoidable error is called as an exception.

Q 8 - What will be the output of the following program?

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

using namespace std;
main() {
   cout<<strcmp("strcmp()","strcmp()");
}

A - 0

B - 1

C - -1

D - Invalid use of strcmp() function

Answer : A

Explaination

0, strcmp return 0 if both the strings are equal

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

using namespace std;
main() {
   cout<<strcmp("strcmp()","strcmp()");
}

Q 9 - The default executable generation on UNIX for a C++ program is ___

A - a.exe

B - a

C - a.out

D - out.a

Answer : C

Explaination

a.out is the default name of the executable generated on both the UNIX and Linux operating systems.

Q 10 - What is the built in library function to compare two strings?

A - string_cmp()

B - strcmp()

C - equals()

D - str_compare()

Answer : B

Explaination

strcmp() is the built in function from string.h to compare two strings. Returns 0 if both are same strings. Returns -1 if first < second string. Returns 1 first > second.

cpp_questions_answers.htm
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