RosettaCodeData/Task/Jensens-Device/Ruby/jensens-device-3.rb

def sum lo, hi, &term
  (lo..hi).sum(&term)
end
p sum(1,100){|i| 1.0/i}   # => 5.187377517639621
# or using Rational:
p sum(1,100){|i| Rational(1,i)}  # => 14466636279520351160221518043104131447711 / 2788815009188499086581352357412492142272
Another update from ingydotnet^djgoku 2015-11-18 06:14:39 +00:00			`def sum lo, hi, &term`
September Morn Update 2019-09-12 10:33:56 -07:00			`(lo..hi).sum(&term)`
Another update from ingydotnet^djgoku 2015-11-18 06:14:39 +00:00			`end`
September Morn Update 2019-09-12 10:33:56 -07:00			`p sum(1,100){\|i\| 1.0/i} # => 5.187377517639621`
Another update from ingydotnet^djgoku 2015-11-18 06:14:39 +00:00			`# or using Rational:`
September Morn Update 2019-09-12 10:33:56 -07:00			`p sum(1,100){\|i\| Rational(1,i)} # => 14466636279520351160221518043104131447711 / 2788815009188499086581352357412492142272`