The process of deriving many classes from a base class is known as hierarchical inheritance In c++.

Syntax of Hierarchical inheritance:
class A
{
// body of the class A.
}
class B : public A
{
// body of class B.
}
class C : public A
{
// body of class C.
}
class D : public A
{
// body of class D.
}
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Let’s live example:
#include <iostream> using namespace std; class Shape // Declaration of base class. { public: int a; int b; void get_data(int n,int m) { a= n; b = m; } }; class Rectangle : public Shape // inheriting Shape class { public: int rect_area() { int result = a*b; return result; } }; class Triangle : public Shape // inheriting Shape class { public: int triangle_area() { float result = 0.5*a*b; return result; } }; int main() { Rectangle r; Triangle t; int length,breadth,base,height; std::cout << "Enter the length and breadth of a rectangle: " << std::endl; cin>>length>>breadth; r.get_data(length,breadth); int m = r.rect_area(); std::cout << "Area of the rectangle is : " <<m<< std::endl; std::cout << "Enter the base and height of the triangle: " << std::endl; cin>>base>>height; t.get_data(base,height); float n = t.triangle_area(); std::cout <<"Area of the triangle is : " << n<<std::endl; return 0; }
Output:
Enter the length and breadth of a rectangle:
23
20
Area of the rectangle is : 460
Enter the base and height of the triangle:
2
5
Area of the triangle is : 5
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