[Haskell-cafe] Roman Numerals and Haskell Syntax abuse

George Russell ger at informatik.uni-bremen.de
Mon Jul 5 06:08:45 EDT 2004

The following declaration for a function for converting positive
integers to Roman numerals is 181 characters long.

Is there a shorter one?

roman=f[(i-j,i)|i<-[2,4..8],j<-[2,1]]where f(d@((a,b):c))n|n<1=""|n>=t!!a=s!!a:f d(n-t!!a)|1>0=if n+t!!b>=t!!a then s!!b:f d(n+t!!b)else f c n;s="mdclxvi";t=[1000,500,100,50,10,5,1]

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