Object Oriented Programming (OOPs) Multiple Choice Questions & Answers (MCQs) on “Static Member Functions”.
1. Which among the following is correct definition for static member functions?
a) Functions created to allocate constant values to each object
b) Functions made to maintain single copy of member functions for all objects
c) Functions created to define the static members
d) Functions made to manipulate static programs
Answer: b
Clarification: The functions which are made common, with respect to definition and data usage, to all the objects. These functions are able to access the static data members of a class.
2. The static member functions __________________
a) Have access to all the members of a class
b) Have access to only constant members of a class
c) Have access to only the static members of a class
d) Have direct access to all other class members also
Answer: c
Clarification: The static member functions are common for all the objects. These functions can use only the static members of a class in which those are defined. This is because other members change with respect to each object created.
3. The static member functions ____________________
a) Can be called using class name
b) Can be called using program name
c) Can be called directly
d) Can’t be called outside the function
Answer: a
Clarification: The static members can be accessed using class name also. This is because the static members remain common to all the objects. Hence objects are not required.
4. Which is correct syntax to access the static member functions with class name?
a) className . functionName;
b) className -> functionName;
c) className : functionName;
d) className :: functionName;
Answer: d
Clarification: The scope resolution operator must be used to access the static member functions with class name. This indicates that the function belongs to the corresponding class.
5. Which among the following is not applicable for the static member functions?
a) Variable pointers
b) void pointers
c) this pointer
d) Function pointers
Answer: c
Clarification: Since the static members are not property of objects, they doesn’t have this pointer. Every time the same member is referred from all the objects, hence use of this pointer is of no use.
6. Which among the following is true?
a) Static member functions can’t be virtual
b) Static member functions can be virtual
c) Static member functions can be declared virtual if it is pure virtual class
d) Static member functions can be used as virtual in Java
Answer: a
Clarification: The static member functions can’t be virtual. This is a restriction on static member functions, since the definition should not change or should not be overridden by any other function of derived class. The static members must remain same for all the objects.
7. The static members are ______________________
a) Created with each new object
b) Created twice in a program
c) Created as many times a class is used
d) Created and initialized only once
Answer: d
Clarification: The static members are created only once. Then those members are reused whenever called or invoked. Memory is allocated only once.
8. Which among the following is true?
a) Static member functions can be overloaded
b) Static member functions can’t be overloaded
c) Static member functions can be overloaded using derived classes
d) Static member functions are implicitly overloaded