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#!/usr/bin/env python3
# Challenge 084
#
# TASK #1 > Reverse Integer
# Submitted by: Mohammad S Anwar
# You are given an integer $N.
#
# Write a script to reverse the given integer and print the result. Print 0 if
# the result doesn't fit in 32-bit signed integer.
#
# The number 2,147,483,647 is the maximum positive value for a 32-bit signed binary
# integer in computing.
#
# Example 1:
# Input: 1234
# Output: 4321
# Example 2:
# Input: -1234
# Output: -4321
# Example 3:
# Input: 1231230512
# Output: 0
import sys
def reverse_int(n):
if n < -0x80000000 or n > 0x7fffffff:
return 0
rev = 0
if n < 0:
sign = -1
n = -n
else:
sign = 1
while n > 0:
rev = 10 * rev + n%10
n //= 10
rev *= sign
return rev
print(reverse_int(int(sys.argv[1])))
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