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- #!/usr/bin/ruby
- #
- ## https://rosettacode.org/wiki/Extreme_floating_point_values
- #
- var inf = (1 / 0) #=> Inf
- var nan = (0 / 0) #=> NaN
- var exprs = [
- "1.0 / 0.0", "-1.0 / 0.0", "0.0 / 0.0", "- 0.0",
- "inf + 1", "5 - inf", "inf * 5", "inf / 5", "inf * 0",
- "1.0 / inf", "-1.0 / inf", "inf + inf", "inf - inf",
- "inf * inf", "inf / inf", "inf * 0.0", " 0 < inf", "inf == inf",
- "nan + 1", "nan * 5", "nan - nan", "nan * inf", "- nan",
- "nan == nan", "nan > 0", "nan < 0", "nan == 0", "0.0 == -0.0",
- ]
- exprs.each { |expr|
- "%15s => %s\n".printf(expr, eval(expr))
- }
- say "-"*40
- say("NaN equality: ", NaN == nan) #=> true
- say("Infinity equality: ", Inf == inf) #=> true
- say("-Infinity equality: ", -Inf == -inf) #=> true
- say "-"*40
- say("sqrt(-1) = ", sqrt(-1)); #=> i
- say("tanh(-Inf) = ", tanh(-inf)); #=> -1
- say("(-Inf)**2 = ", (-inf)**2); #=> Inf
- say("(-Inf)**3 = ", (-inf)**3); #=> -Inf
- say("acos(Inf) = ", acos(inf)); #=> Inf*i
- say("atan(Inf) = ", atan(inf)); #=> pi/2
- say("log(-1) = ", log(-1)); #=> pi*i
- say("atanh(Inf) = ", atanh(inf)); #=> -pi/2*i
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