Merge branch 'master' of https://github.com/PaprikaX33/stupidly-simpl…

…e-calculator

calc_main.py

@@ -1,4 +1,35 @@
+#!/usr/bin/env python2
 import math
+import parser as pr
+
+def add(a, b):
+    return a + b
+def red(a, b):
+    return a - b
+def mul(a, b):
+    return a * b
+def div(a, b):
+    return a / b
+def power(a, b):
+    return a ** b
+
+def statement_wrapper():
+    doper = {
+         '+' : add
+        ,'-' : red
+        ,'*' : mul
+        ,'/' : div
+        ,'^' : power
+    }
+    states=raw_input(">>")
+    result=pr.apply(states, darg=doper)
+    if(result == None):
+        print("<< Undefined")
+    else:
+        full = "<< ", str(result)
+        print(full)
+    return
+
 while True:
     print("MENU")
     print("1 for addition :")
@@ -8,42 +39,52 @@
     print("5 for Division:")
     print("6 for floor division:")
     print("7 for factorial:")
+    print("8 for Statement based:")
     choice=int(input("enter any choice:"))
     def additon():
         a=int(input("enter 1st no to perform addition:"))         #a-first input
         b=int(input("enter 2nd no to perform addition:"))          #b-second input
-        c=a+b
+        c=add(a, b)
         print("sum is:",c)
         return
     def subtract():
         a = int(input("enter 1st no to perform subtraction:"))
         b = int(input("enter 2nd no to perform subtraction:"))
-        c = a - b
+        c = red(a, b)
         print("subtraction is:", c)
         return
     def multiplication():
         a = int(input("enter 1st no to perform multipication:"))
         b = int(input("enter 2nd no to perform multiplication:"))
-        c = a*b
+        c = mul(a, b)
         print("multiplication is:", c)
         return
     def power():
         a = int(input("enter base :"))
         b = int(input("enter power :"))
-        c = a**b
+        c = pow(a, b)
         print("division is:", c)
         return
 
     def divide():
         a = int(input("enter 1st no to perform division:"))
         b = int(input("enter 2nd no to perform division:"))
-        c = a/b
+        c = div(a, b)
         print("division is:", c)
         return
-    def floor_division():
-
-
+    #def floor_division():
+
     def factorial():
+        num = int(input("enter a number: "))
+        if num < 0:
+        print("Sorry, factorial does not exist for negative numbers")
+        elif num == 0:
+        print("The factorial of 0 is 1")
+        else:
+        for i in range(1,num + 1):
+        factorial = factorial*i
+        print("The factorial of",num,"is:",factorial)
+        return
 
     if choice==1:
         additon()
@@ -59,6 +100,9 @@ def factorial():
         floor_division()
     elif choice==7:
         factorial()
+    elif choice==8:
+        statement_wrapper()
     else:
         print("wrong input")
-        exit(0)
+        exit(0)
+

parser.py

@@ -0,0 +1,52 @@
+#module tokenization
+import re
+
+def apply(string, sarg = {}, darg = {}):
+    return execute(to_postfix(tokenize(string)), sarg=sarg, darg=darg)
+
+def execute(statement, sarg = {}, darg = {}):
+    stack = []
+    for elem in statement :
+        if elem[0].isdigit() :
+            stack.append(float(elem))
+        elif elem in sarg :
+            operand = stack.pop()
+            stack.append(sarg[elem](operand))
+        elif elem in darg :
+            operandb = stack.pop()
+            operanda = stack.pop()
+            stack.append(darg[elem](operanda, operandb))
+    if len(stack) == 1 :
+        return stack.pop()
+    else:
+        return None
+
+
+def tokenize(strng):
+    return filter(None, re.split("([\+\-\/\*\!\(\)])", strng.replace(" ", "")))
+
+def to_postfix(tokens):
+    output = []
+    operst = []
+    for opt in tokens:
+        if opt[0].isdigit():
+            output.append(opt)
+        elif opt == ")":
+            while True:
+                if len(operst) == 0 :
+                    return []
+                temp = operst.pop()
+                if temp == "(" :
+                    break;
+                else:
+                    output.append(temp)
+        else:
+            operst.append(opt)
+    for something in operst :
+        if something == "(" :
+            return []
+    while True :
+        output.append(operst.pop())
+        if len(operst) == 0:
+            break;
+    return output