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C++ Mock Test

This section presents you various set of Mock Tests related to C++ Framework. You can download these sample mock tests at your local machine and solve offline at your convenience. Every mock test is supplied with a mock test key to let you verify the final score and grade yourself.

If a member/s appear in the class with following no access specifier, the default is private.

Few characters have alternative representation and start with ??. Eg. Fro [ equivalent is ??(

C++ supports all the forms of inheritance.

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

A pure virtual function cannot have a definition.

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

Q 7 - 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

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 8 - 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

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;
}

The purpose of the constructor cannot be overridden in the derived class hence constructor cannot be a virtual.

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

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

All the rest are valid keywords of C++.

i=i, is assigning member variable to itself.

#include<iostream>

using namespace std;
class abc { 

   public: 
      int i; 

      abc(int i) { 
         i = i;
      }
};

main() { 
   abc m(5); 
   
   cout<<m.i;
}

If no access specifiers are specified for structure variables/functions, then the default is considered as public.

Its an object of istream class.

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.

With the syntax as in (a) the compiler first looks for the file in the present working directory and then in the default include path if not found.

wchar_t is the data type using which we can hold Unicode characters.

mutable is storage specifier introduced in C++ which is not available in C. A class member declared with mutable is modifiable though the object is constant.

There is no such operator in C/C++.

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

Q 24 - We can have varying number of arguments for the overloaded form of () operator.

A - True

B - False

Both the mentioned operators cannot be overloaded.

cpp_questions_answers.htm

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