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#!/usr/bin/env python
# Challenge 002
#
# Challenge #2
# Write a script that can convert integers to and from a base35
# representation, using the characters 0-9 and A-Y. Dave Jacoby came up
# with nice description about base35, in case you needed some background.
import sys
def format_digit(n):
if n<10:
return chr(n+ord('0'))
else:
return chr(n+ord('A')-10)
def format_number(n, base):
negative = True if n<0 else False
n = abs(n)
output = ""
while True:
d = n % base
n = int(n / base)
output = format_digit(d) + output
if n == 0: break
if negative:
output = "-" + output
return output
def scan_digit(str):
str = str.upper()
if str >= "0" and str <= "9":
return ord(str)-ord("0")
elif str >= "A" and str <= "Z":
return ord(str)-ord("A")+10
else:
return -1
def scan_number(str, base):
n, negative = 0, False
if str[0] == "-":
str = str[1:]
negative = True
while str != "":
d = scan_digit(str[0])
str = str[1:]
assert d>=0 and d<base
n = n*base + d
if negative:
n = -n
return n
if sys.argv[1] == "-r":
print(scan_number(sys.argv[2], 35))
else:
print(format_number(int(sys.argv[1]), 35))
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