From 67393f42f41ab92219deb549f711121c4dab845b Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <vn.mcsinyx@gmail.com>
Date: Sun, 15 Dec 2019 10:34:58 +0700
Subject: [usth/ICT2.2] Object Oriented Programming

---
 usth/ICT2.2/labwork/5/virtual.cc | 61 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 usth/ICT2.2/labwork/5/virtual.cc

(limited to 'usth/ICT2.2/labwork/5/virtual.cc')

diff --git a/usth/ICT2.2/labwork/5/virtual.cc b/usth/ICT2.2/labwork/5/virtual.cc
new file mode 100644
index 0000000..23ae78a
--- /dev/null
+++ b/usth/ICT2.2/labwork/5/virtual.cc
@@ -0,0 +1,61 @@
+#include <cmath>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+static constexpr double PI = acos (-1.0);
+
+class Shape
+{
+public:
+  virtual string get_name () const = 0;
+
+  virtual double cal_area () const { return 0.0; }
+  virtual double cal_vol () const { return 0.0; }
+};
+
+class Point : public Shape
+{
+public:
+  double x, y;
+  Point (double a, double b) : x {a}, y {b} {}
+
+  string get_name () const override { return "Point"; }
+};
+
+class Circle : public Shape
+{
+public:
+  double x, y, r;
+  Circle (double a, double b, double c) : x {a}, y {b}, r {c} {}
+
+  string get_name () const override { return "Circle"; }
+  double cal_area () const override { return r * r * PI; }
+};
+
+class Cylinder : public Shape
+{
+public:
+  double x, y, r, h;
+  Cylinder (double a, double b, double c, double d)
+    : x {a}, y {b}, r {c}, h {d} {}
+
+  string get_name () const override { return "Cylinder"; }
+  double cal_area () const override { return (r + h) * r * PI * 2.0; }
+  double cal_vol () const override { return r * r * h * PI; }
+};
+
+int
+main ()
+{
+  vector<unique_ptr<Shape>> v;
+  v.push_back (make_unique<Point> (1.0, 2.0));
+  v.push_back (make_unique<Circle> (3.0, 4.0, 5.0));
+  v.push_back (make_unique<Cylinder> (6.0, 7.0, 8.0, 9.0));
+  for (auto& p : v)
+    cout << p->get_name () << " of area " << p->cal_area ()
+         << " and volume " << p->cal_vol () << endl;
+}
-- 
cgit 1.4.1