Question

C++ problem

a 6. 9. Read the following program carefully and answer questions. Rinclude <iostream using namespace std; class Grand Parent public Grand Parent cout "Grandparent constructor! <<endl. class Father public GrandParent public: Father Grandparent cout "Father Constructor Kendl. void cout In Father functiob <<endl y virtual void cout In Father, y function <<endl i class Mother public Grand Parent public Motber() Grandparent() cout Mother Constructor <<endl void cout "In Nother, x function <<endli yo void y() cout <<"In Mother, y function..." <<endl class Child public Father, public Motber public: Child() Notber Father cout "Child Constructor <<endl void y() cout <<"In child, y function <<endl i int main() Q6. What do you expect? Child c Q7. What do you expect? c. Father x() Mother amom norm->x(); Q8. What do you expect? return 0 A 3 ft 5 a

Answer 1

6)In the main function, what do expect by the line "Child c;"?Explain Why.

Explaination:

a)This is the best example of Hybrid Inheritance.
So Child class is derived class and which is at the last level so in inheritance we need to create
an object of Derived class which is situated at the end of structure of inheritace (ie Child is derived class of Mother & Father class which is situated at last level).
b)as we have created an object of Child with name c it implicitly call constructor of Mother & Father ,through that GrandFather Constructor gets call twice (Through Mother & Father Constructor)
So it will show an output which is mentioned as below
  
Grand Parent Constructor
Father Constructor
Grand Parent Constructor
Mother Constructor
Child Constructor

7)In the main function, what do expect by the line "c.Father::x();"?Explain Why.

   Explaination :

   a)c.Father::x() this statement is stating that object of Child class is accessing Father class & its method x().so to get direct access of father we use scope resolution operator to get access of x()
   method of father class.
   b)as x() function of father class gets call from child class it shows an output "In father ,x function " & as control goes on next line it calls the y() function of Child class .so output would be like this
   "In child, y function "
   Complete output of statment c.Father::x() is
  
   In Father,x function
   In Child, y function

8)In the main function, what will you have outputs by the line "mom->x();"?Explain Why.
         
   Explaination :
  
   a)Outputs by the line "mom->x()"
      
   In Mother , x function
   In Mother, y function

   b)This is the best example of virtual function. If we try to call x() function of mother with object of child then it will create an ambiguity because child class has same function as Mother class with same name as x() function
   so it will create an ambiguity. So to resolve this problem we have created an pointer object to store reference of Child object.
   we cant use (.) operator to call x() function because we have created pointer object so to call x() function with an object of Mother class we have to use (->) operator.
   first mom->x() it will give call to x() function of Mother class and display an output "In Mother, x function" & as control goes down it will call y() function of mother class.

9)Explain Polymorphism with the above program.

   Explaination:
  
   Above example is the best example of Runtime Polymorphism ie It shows the Function Overriding .
   Multiple classes have same function with same name & same signature.here we can see y() function is used in all the classes except GrandParent even x() function is used in Father & Mother classes.
   All overrided functions have same name and signature in all classes. this is all about polymorphism with above program.