From e7124f5b5763e51e5eedcf88de72cb50eb1dc60b Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Wed, 8 Apr 2020 09:47:45 +0200
Subject: [PATCH] =?UTF-8?q?V=C3=BDrazy:=20Je=C5=A1t=C4=9B=20objektov=C3=A1?=
=?UTF-8?q?=20verze=20s=20d=C4=9Bdi=C4=8Dnost=C3=AD?=
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---
06-vyrazy/objektove.py | 66 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100755 06-vyrazy/objektove.py
diff --git a/06-vyrazy/objektove.py b/06-vyrazy/objektove.py
new file mode 100755
index 0000000..95659f6
--- /dev/null
+++ b/06-vyrazy/objektove.py
@@ -0,0 +1,66 @@
+#!/usr/bin/python3
+
+class Node:
+
+ def eval(self):
+ raise NotImplemented()
+
+
+class NumNode(Node):
+
+ def __init__(self, x):
+ self.value = x
+
+ def __str__(self):
+ return str(self.value)
+
+ def eval(self):
+ return self.value
+
+
+class BinaryNode(Node):
+
+ def __init__(self, left, right):
+ self.left = left
+ self.right = right
+
+
+class AddNode(BinaryNode):
+
+ def __str__(self):
+ return '(' + str(self.left) + '+' + str(self.right) + ')'
+
+ def eval(self):
+ return self.left.eval() + self.right.eval()
+
+
+class SubNode(BinaryNode):
+
+ def __str__(self):
+ return '(' + str(self.left) + '-' + str(self.right) + ')'
+
+ def eval(self):
+ return self.left.eval() - self.right.eval()
+
+
+class MulNode(BinaryNode):
+
+ def __str__(self):
+ return '(' + str(self.left) + '*' + str(self.right) + ')'
+
+ def eval(self):
+ return self.left.eval() * self.right.eval()
+
+
+class DivNode(BinaryNode):
+
+ def __str__(self):
+ return '(' + str(self.left) + '/' + str(self.right) + ')'
+
+ def eval(self):
+ return self.left.eval() // self.right.eval()
+
+
+x = AddNode(MulNode(NumNode(3), NumNode(4)), SubNode(NumNode(5), NumNode(6)))
+print(x)
+print(x.eval())
--
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