Question

Assume you have a class Square. This class has an instance variable, side that is protected and of type double. Write the class definition of a subclass of Square called FancySquare that has a method called getDiagonal. The getDiagonal method gets no arguments but returns the value of side multiplied by the square root of two.

Answer 1

#include<iostream>

#include<math.h>

using namespace std;

class Square

{

protected:

double side;

public:

void set(int s) //sets value of side

{

side=s;

}

};

class FancySquare : public Square //inheriting publicly

{

public:

double getDiagonal() //returns diagonal of type double

{

return side*(sqrt(2));

}

};

int main() {

FancySquare f; //instantiating class

f.set(4);

cout<<f.getDiagonal(); //returns diagonal of side 4

return 0;

}

OUTPUT :

5.65685

Step-by-step explanation:

In the above code, a set() method with public access specifier is defined which takes a value of int type and sets its value to side variable, which is of int type. FancySquare is a class which inherits publicly from class Square and contains a member function getDiagonal() which uses data member side of its parent class Square. In the main method, an object of class FancySquare is created and getDiagonal() is called.