pro3 solved

Author: yyl

unit3/.pro3.py.swp

@@ -1,2 +1,5 @@
-58.0
-0.142857142857
+(((5.5 + 9) * 2) + (6 * 1.5)) = 
+(5.5 + 5) = 
+(((5.5 / 2) + 4) * 5) = 
+(5 ^ 2) = 
+(-5 + 5) = 

unit3/output.txt

@@ -0,0 +1,30 @@
+from opus7.stackAsLinkedList import StackAsLinkedList
+
+class Algorithms(object):
+
+  def __init__(self):
+    self.stack = StackAsLinkedList()
+
+  def calculator(self, input, output):
+    operators = ["+", "-", "*", "/", "^"]
+    for line in input.readlines():
+      for word in line.split():
+        if word in operators:
+          print "it is operator ", word
+          arg2 = self.stack.pop()
+          arg1 = self.stack.pop()
+          self.stack.push("(%s %s %s)" % (arg1, word, arg2))
+        elif word == "=":
+          print "it is ="
+          arg = self.stack.pop()
+          output.write(arg + " = " + "\n")
+          print "ans is ", arg
+        else:
+          print "it is number, push it"
+          # make it double
+          self.stack.push(word)
+
+
+a = Algorithms()
+a.calculator(open("input.txt", 'r'), open("output.txt", 'w+'))
+