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April 5, 2019 04:47
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Second version of arabic to roman numerals converter
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arabic :: String -> Int | |
arabic "" = 0 | |
arabic (x:y:xs) | |
| x == 'C', y == 'M' = 900 + arabic xs | |
| x == 'C', y == 'D' = 400 + arabic xs | |
| x == 'I', y == 'X' = 9 + arabic xs | |
| x == 'I', y == 'V' = 4 + arabic xs | |
arabic (x:xs) | |
| x == 'M' = 1000 + arabic xs | |
| x == 'D' = 500 + arabic xs | |
| x == 'C' = 100 + arabic xs | |
| x == 'X' = 10 + arabic xs | |
| x == 'V' = 5 + arabic xs | |
| x == 'I' = 1 + arabic xs | |
| otherwise = 0 + arabic xs |
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Removing repetitions so that code is cleaner than before, but I'm sure the final part could be replaced with a tuple list.