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#! /usr/bin/ruby
def ri(s)
r=s.to_s.reverse
if r =~ /([0-9]+)-$/
r='-' + $1
end
r=Integer(r)
b=[r].pack('l').unpack('l')[0]
if b != r
return 0
end
return r
end
require 'test/unit'
class TestRi < Test::Unit::TestCase
def test_ex1
assert_equal(4321,ri(1234),'example 1')
end
def test_ex2
assert_equal(-4321,ri(-1234),'example 2')
end
def test_ex3
assert_equal(0,ri(1231230512),'example 3')
end
end
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