Arithmetic/Rational: Difference between revisions
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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Ruby has a Rational class in it's core since 1.9. |
Ruby has a Rational class in it's core since 1.9. |
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<lang ruby> |
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<lang ruby>require 'rational' #Only needed in Ruby < 1.9 |
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for candidate in 2 .. 2**19 |
for candidate in 2 .. 2**19 |
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sum = Rational(1, candidate) |
sum = Rational(1, candidate) |
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for factor in 2 ... |
for factor in 2 .. Integer.sqrt(candidate) |
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if candidate % factor == 0 |
if candidate % factor == 0 |
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sum += Rational(1, factor) + Rational(1, candidate / factor) |
sum += Rational(1, factor) + Rational(1, candidate / factor) |
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