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Roman numerals/Decode: Difference between revisions
add Ruby
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</pre>
=={{header|Ruby}}==
<lang ruby>def fromRoman(roman)
r = roman.dup
n = 0
until r.empty? do
case
when r.start_with?('M') then v = 1000; len = 1
when r.start_with?('CM') then v = 900; len = 2
when r.start_with?('D') then v = 500; len = 1
when r.start_with?('CD') then v = 400; len = 2
when r.start_with?('C') then v = 100; len = 1
when r.start_with?('XC') then v = 90; len = 2
when r.start_with?('L') then v = 50; len = 1
when r.start_with?('XL') then v = 40; len = 2
when r.start_with?('X') then v = 10; len = 1
when r.start_with?('IX') then v = 9; len = 2
when r.start_with?('V') then v = 5; len = 1
when r.start_with?('IV') then v = 4; len = 2
when r.start_with?('I') then v = 1; len = 1
else
raise ArgumentError.new("invalid roman numerals: " + roman)
end
n = n + v
r[0 .. len-1] = ""
end
n
end
[ "MCMXC", "MMVIII", "MDCLXVI" ].each {|r| pp [r, fromRoman(r)]}</lang>
outputs
<pre>["MCMXC", 1990]
["MMVIII", 2008]
["MDCLXVI", 1666]</pre>
=={{header|Seed7}}==
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