benchmark number reverse

gistfile1.rb

require 'benchmark'

n, exec_time = 123456789123456789123456789123456789123456789, 0

100000.times do
  exec_time += Benchmark.measure do
    r = 0
    r, n = (r*10 + n % 10), n / 10 while n != 0
    r
  end.real
end

puts exec_time/100000.0

n, exec_time = "123456789123456789123456789123456789123456789", 0

100000.times do
  exec_time += Benchmark.measure do
    n = n.to_s.reverse.to_i
  end.real
end

puts exec_time/100000.0