USING C++:

Consider the following class definition:

class rectangle { public: rectangle() { width = 0; length = 0;} void setDimensions(double w, double l) { width = w; length = l;} double perimeter() { return 2 *(width + length); } private: double width; double length; }; 

What does the following code print:

rectangle r1; cout<<"Perimeter="<