RosettaCodeData/Task/Nth/Crystal/nth.crystal

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struct Int
def ordinalize
num = self.abs
ordinal = if (11..13).includes?(num % 100)
"th"
else
case num % 10
when 1; "st"
when 2; "nd"
when 3; "rd"
else "th"
end
end
"#{self}#{ordinal}"
end
end
[(0..25),(250..265),(1000..1025)].each{|r| puts r.map{ |n| n.ordinalize }.join(", "); puts}