The form of inheritance in which more than one classes are derived from single base class is known as hierarchical inheritance. We can implement the hierarchical inheritance by defining at least three classes in which one is base class and the remaining two classes is derived from the same one base class.
SYNTAX:- class base_class_name
{
private:
…………….
public:
…………….
};
class derived_class_name1 : public base_class_name
private:
……………
public:
……………
};
class derived_class_name2 : public base_class_name
private:
…………..
public:
…………..
};
Program:
/*PROGRAM TO IMPLEMENT HIERARCHICAL INHERITANCE USING PARAMETERIZED CONSTRUCTOR IN CLASSES*/
#include<conio.h>
#include<iostream.h>
#include<string.h>
class base
{
char name[15];
int age;
public:
base(char n[15],int a)
{
strcpy(name,n);
age=a;
}
void show()
{
cout<<“Name: “<<name<<endl;
cout<<“Age: “<<age<<endl;
}
~base()
{
cout<<“Destructor of base class is executed”<<endl;
}
};
class derived1:public base
{
int salary;
public:
derived1(char n[15],int a,int s):base(n,a)
{
salary=s;
}
void show1()
{
cout<<“Salary: “<<salary<<endl;
}
~derived1()
{
cout<<“Destructor of derived1 class is
executed”<<endl;
}
};
class derived2:public base
{
int salary;
public:
derived2(char n[15],int a,int s):base(n,a)
{
salary=s;
}
void show2()
{
cout<<“Salary: “<<salary<<endl;
}
~derived2()
{
cout<<“Destructor of derived2 class is
executed”<<endl;
}
};
void main()
{
clrscr();
cout<<“Data for first person:”<<endl;
{
derived1 d1(“abc”,21,25000);
d1.show();
d1.show1();
}
cout<<“data for second person:”<<endl;
{
derived2 d2(“xyz”,25,30000);
d2.show();
d2.show2();
}
getch();
}