Complete program for Rectangle class

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 area of the Rectangle. The << operator should be written as a friend of the Rectangle class. Use this main() . int main() { Rectangle R(6,4); cout << R << " has area " << !R << endl; R += 5; cout << R << " has area " << !R << endl; } It should produce the output: Rectangle: length=6 width=4 has area 24 Rectangle: length=11 width=9 has area 99