feat(ex03): it works

ex03/Point.cpp

@@ -0,0 +1,24 @@
+#include "Point.hpp"
+#include <iostream>
+
+Point::Point() : x(0), y(0) {}
+Point::Point(float x, float y) : x(Fixed(x)), y(Fixed(y)) {}
+Point::Point(Point const &other) : x(other.x), y(other.y) {}
+Point &Point::operator=(const Point &other) {
+  (void)other;
+  std::cerr << "WARNING: called Point::operator=, which is a noop due to x and "
+               "y being const."
+            << std::endl;
+  return *this;
+};
+Point::~Point() {}
+
+Fixed Point::triangleArea(Point const &a, Point const &b, Point const &c) {
+  return (((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))) / 2)
+      .abs();
+}
+
+std::ostream &operator<<(std::ostream &stream, const Point &p) {
+  stream << "(" << p.x << ", " << p.y << ")";
+  return stream;
+}