5. Write a C++ program that implements an oval class. The program should output

Question

5. Write a C++ program that implements an oval class. The program should output the width, length and area of the oval. The user should let the user enter the values from the keyboard to pass to the constructor. Use UML class diagram provided. Place all classes into one file. Output should be user friendly. Oval -length: double -width: double +Oval(double, double) +setLength(double): void +getLength(): double +setWidth(double): void +getWidth(): double +area(): double Name the program: TestovalxX.cpp, where XX are your initials

Explanation / Answer

#include <iostream>

using namespace std;

// class oval defination
class Oval
{
    private:
  
   /// length and width are private member so they cannot access out of the class
    double length;
    double width;
  
    public:
  
  
    //constructor which is tacking double double as parameter
    Oval(double x, double y)
    {
        length = x,width = y;
    }
  
    // function to set length given by user
    void setLength(double l)
    {
        std::cout<<"setting length = "<<l<<endl;
        length = l;
    }
  
    // function to set width given by user
    void setWidth(double w)
    {
        std::cout<<"setting width = "<<w<<endl;
        width = w;
    }
  
    // function to return length given by user
    double getLength(void)
    {
        return length;
    }
  
    // function to return width given by user
    double getWidth(void)
    {
        return width;
    }
  
    /*
  
    function to find the area of Oval
    area of the oval is 3.14* half_length * half_width
    returning answer of the calculation
    */
    double area(void)
    {
        // calculation obal_area = pai * half_length * half_width
       return ((3.14 * (length/2)*(width/2)));
    }
  
};

int main()
{
    double length,width;
  
    cout<<"Enter length and width ";
  
    // getting user input
    cin>>length>>width;
  
    //creating class object with parameter given by user
    Oval obj(length,width);
  
    //finding ares by area() method
    cout<<"area of oval is "<<obj.area()<<endl;
  
    // Demo of setWidth() and setLength() function use case
    obj.setWidth(20);
    obj.setLength(20);
  
    //finding ares by area() method
    cout<<"area of oval is "<<obj.area()<<endl;
    return 0;
}

/*
OUTPUT:

Enter length and width                                                                                                
100 100                                                                                                               
area of oval is 7850                                                                                                  
setting width = 20                                                                                                    
setting length = 20                                                                                                   
area of oval is 314
*/

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