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Program 4

#include <cmath>
#include <iostream>
#include "rect.h"

Rectangle::Rectangle(): upper_left(-1,1), lower_right(1,-1){
}

Rectangle::Rectangle(Point p1, Point p2): upper_left(p1), lower_right(p2){
}

Rectangle::Rectangle(double x1, double y1, double x2, double y2):
      upper_left(x1,y1), lower_right(x2,y2){
}