[Haskell-cafe] Re: Roman Numerals and Haskell Syntax abuse

[Christian Maeder]

Christian Maeder wrote:
>> George Russell wrote (snipped):
>>
>> Now 145.
>> roman=(0#);a#n|n<1=""|n>=t!!a=s!!a:a#(n-t!!a)|n+t!!b>=t!!a=s!!b:a#(n+t!!b)|1>0=(a+1)#n 
>> where b=2*div a 2+2;s="mdclxvi";t=[1000,500,100,50,10,5,1]
> 
> 
> 138
> roman=(!6);n!a|n<1=""|n>=t=s!!a:(n-t)!a|n+c>=t=s!!(2*e):(n+c)!a|1>0=n!(a-1)where(d,m)=a`divMod`2;e=d+m-1;s="ivxlcdm";c=10^e;t=10^d*(1+4*m) 
> 
now 134
roman=(!6);n!a|n<1=""|n>=t=s!!a:(n-t)!a|c>=t=s!!(2*e):c!a|1>0=n!(a-1)where(d,m)=a`divMod`2;e=d+m-1;s="ivxlcdm";c=10^e+n;t=10^d*(1+4*m)