Question

Use DevC++ to implement a program uses objected oriented programming to calculate the area of a rectangle. The program should create a Rectangle class that has the following attributes and member functions:

Attributes:
width and length

Member functions:
setWidth(), setLength(), getWidth() , getLength(), getArea()

Where width and length are the respect width and length of a Rectangle class. The setWidth() and setLength() member function should set the length and width, the getWidth(), getLenght(), and getArea() member function should get the length, width, and area. The program should

1. Ask the user for the length and width of rectangle.

2. Output the length, width, and area of a rectangle.

3. Continue to ask the user to calculate another rectangle area by asking length and width.

C++ ONLY

Answer 1

#include<iostream>
using namespace std;
//rectangle class
class rectangle
{
    private: //attributes of the rectangle
        double width;
        double length;
    public:   
      void setWidth(double)   ;//method to set the width
      void setLength(double); //method to set the length
      double getLength(); //method to get the length
      double getWidth();//method to get the width
      double getArea();//method to return the area
};
//definations of the methods()
void rectangle :: setLength(double l)
{
   length = l;
}
void rectangle :: setWidth(double w)
{
   width=w;
}
double rectangle :: getLength()
{
   return length;
}
double rectangle :: getWidth()
{
   return width;
}
  
double rectangle :: getArea()
{
   return length * width;
}
//driver program
int main()
{
    rectangle robj;//declaration of object
    double a,b,ar;
    char ch;
    //infinite loop
    while(1)
    {
    cout<<endl<<"Enter the length of rectangle"   ;
    cin>>a; //input the length
    cout<<endl<<"Enter the width of rectangle";
    cin>>b; //input the width
    //validate the length
    while(a<=0)
    {
       cout<<endl<<"Invalid length";
       cout<<endl<<"Enter the length of rectangle"   ;
    cin>>a;
           }
           //validate the width
           while(b<=0)
    {
       cout<<endl<<"Invalid Width";
       cout<<endl<<"Enter the Width of rectangle"   ;
    cin>>b;
           }
    //set the length
    robj.setLength(a);
    //set the width
    robj.setWidth(b);
    //display the details
    cout<<endl<<"Length of the Rectangle : "<<robj.getLength()<<" units.";
    cout<<endl<<"Width of the Rectangle : "<<robj.getWidth()<<" units.";
    cout<<endl<<"Area of the Rectangle : "<<robj.getArea()<<" Sq. units.";
    //ask for choice
    cout<<endl<<"Do you want to find more area[y/n]";
    cin>>ch;
    if(ch=='y' || ch=='Y')
    continue;
           else
           break;
   }
}
  

output