C++ Questions

Q:

Where does the allocaters are implemented?

A) Template library B) Standard library
C) C++ code library D) None of these
 
Answer & Explanation Answer: B) Standard library

Explanation:

Allocaters are implemented in C++ standard library but it is used for C++ template library.

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Q:

What are the methods are available in storing sequential files?

A) Natural merging B) Polyphase sort
C) Distribution of Initial runs D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

ll the above listed methods are used in storing sequential files

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Q:

Default constructor accepts how many arguments?

A) one B) two
C) three D) None
 
Answer & Explanation Answer: D) None

Explanation:

Default constructors has no arguments

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Q:

What does inheriatance allows you to do?

A) create a class B) access methods
C) create a hierarchy of classes D) None of the mentioned
 
Answer & Explanation Answer: C) create a hierarchy of classes

Explanation:
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Q:

Explain storage qualifiers in C++

Answer

i.) Const - This variable means that if the memory is initialised once, it should not be altered by a program. 


ii.) Volatile - This variable means that the value in the memory location can be altered even though nothing in the program code modifies the contents. 


iii.) Mutable - This variable means that a particular member of a structure or class can be altered even if a particular structure variable, class, or class member function is constant.

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Q:

What are the advantages of using friend classes?

Answer

- Friend classes are useful when a class wants to hide features from users which are needed only by another, tightly coupled class. 


- Implementation details can be kept safe by providing friend status to a tightly cohesive class.

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Q:

Where is the reference stored?

A) stack B) heap
C) queue D) None
 
Answer & Explanation Answer: A) stack

Explanation:

Referencee is stored in stack

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Q:

What is a Wrapper class?

Answer

Wrapper classes wrap primitive values in a class and offers utility to access them through objects. Some of the primitive wrapper data types are:


Byte, short, int, long, float, double, char, Boolean.


Example: 


Create a class name VectorAdd to populate it with integer values using the add(int, object) method.


public class VectorAdd


{


       public static void main(String argv[])


       {


             Vector v = new Vector();


             v.add(0,new Integer(10));


             v.add(1,new Integer(20));


             v.add(2,new Integer(30));


             for(int i=0; i < v.size();i ++)


             {


                  Integer iw =(Integer) v.get(i);


                  System.out.println(iw);


             }


       }


}

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