Question

C++

Create a Rectangle class that has 2 constructors. The class should have private or protected fields: length and width and a public display function.

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new c++ program with name "main.cpp" is created, which contains following code.

main.cpp :

//c++ program to calculate area of Rectangle
//header files
#include <iostream>
using namespace std;
//class Rectangle
class Rectangle{
private :
double length;
double width;
public:
Rectangle(); //default constructor
Rectangle(double l,double w); //parameterized constructor
double area(); //method to calculate area
void display(); //method to display area
};
//default constructor assigning length and width to zero
Rectangle::Rectangle()
{
length=0;
width=0;
}
//parameterized constructor
Rectangle::Rectangle(double l,double w)
{
length=l;
width=w;
}
//method returning area of Rectangle
double Rectangle::area()
{
return length*width; //return area
}
//method display area of Rectangle
void Rectangle::display()
{   
//calling area from this method
cout<<"Area of Rectangle with length : "<<length<<" and width: "<<width<<" is :"<<area()<<endl;
}
//main method
int main()
{
double length, width;
//asking user to enter length
cout<<"Enter Length of Rectangle : "<<endl;
//reading length
cin>>length;
//asking user to enter width
cout<<"Enter Width of Rectangle : "<<endl;
//reading width
cin>>width;
//creating object of Rectangle and passing length and width
Rectangle myRectangle(length,width);
//calling method to display area
myRectangle.display();
return 0;
}

======================================================

Output : Compile and Run above program to get the screens as shown below

Screen 1 :Screen asking length and width

Enter Length of Rectangle: 10 Enter Width of Rectangle 12

Screen 2 :Screen showing area rectangle

Enter Length of Rectangle: 10 Enter Width of Rectangle : 12 Area of Rectangle with length 10 and width: 12 is :120 . Program finished with exit code 0 Press ENTER to exit console.

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.