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#!/usr/bin/python3
# Challenge 034
#
# Task #2
# Contributed by Dave Cross
# Write a program that demonstrates a dispatch table.
import sys
# simple rpn calculator
stack = []
def add():
b = stack.pop()
a = stack.pop()
stack.append(a+b)
def sub():
b = stack.pop()
a = stack.pop()
stack.append(a-b)
def mul():
b = stack.pop()
a = stack.pop()
stack.append(a*b)
def div():
b = stack.pop()
a = stack.pop()
stack.append(a/b)
def prt():
print(stack.pop())
dispatch = {'+': add, '-':sub, '*':mul, '/':div, '.':prt}
prog = "".join(sys.argv[1:])
for c in prog:
if c.isspace():
pass
elif c.isdigit():
stack.append(int(c))
else:
dispatch[c]()
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