「フィボナッチ数を出力せよ」をRubyで - Qiita

b, c = ARGV.map(&:to_i) tm = Time.now nxt = 1 + c b1 = 1 s, t = 0, 1 (0..).each do |n| break if Time.now - tm > 1.0 if nxt == n str = s.to_s result = "f(#{n})=" result << if (l = str.length) <= 5 str else str[0, 2] + "(ommit #{l - 4} digits)" + str[-2, 2] end puts result b1 *= b nxt = b1 + c end s, t = t, s + t end $ ruby -v ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux] $ ruby fibo.