************************************************************************ C++ ***

Question

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C++

************************************************************************

Complete the Rectangle class.

class Rectangle
{
    int length, width;
public:
...
};

Overload the +=, +, and << operators.

The += operator should add the int argument to both the length and width members.

The + operator should return the perimeter of the Rectangle.

The << operator should be written as a friend of the Rectangle class.

*************************************************************************

Use this main() as a test.

int main()
{
    Rectangle R(7,3);
    cout << R << " has perimeter " << +R << endl;
    R += 5;
    cout << R << " has perimeter " << +R << endl;    
}

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It should produce the output:

Rectangle: length=7 width=3 has perimeter 20
Rectangle: length=12 width=8 has perimeter 40

Explanation / Answer

#include <iostream>
using namespace std;

class Rectangle
{
int length, width;
public:
  
Rectangle(){
       length=0;
       width=0;
       }
   Rectangle(float a, float b){
       length = a;
       width = b;
       }
       // Overload + operator to add two Box objects.
float operator+ ()
{
return 2*(this->length+this->width);//perimeter
}
// Overload += operator to add two Rectangle objects.
void operator+=(const int b)
{
this->length = this->length + b;
this->width = this->width + b;
}
// Overload + operator to add two Rectangle objects.
friend ostream &operator<<( ostream &output, const Rectangle &r )
{
output << "length : " << r.length << " Width : " << r.width;
return output;
}
};
int main()
{
Rectangle R(7,3);
cout << R << " has perimeter " << +R << endl;
R += 5;
cout << R << " has perimeter " << +R << endl;
}

/*

Output:

length : 7 Width : 3 has perimeter 20
length : 12 Width : 8 has perimeter 40

*/

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