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neokewl

Sat Jan 13, 2007 8:12 pm


Challenging Sum.

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Hi All,

 Check this challenging sum that i came across:

 given below is a grammar for a particular language:

 a = (Int,Int)
 r = a:a | es
 e = Int | e+e | SUM(r) |ref a
 es = e | e,es
 c = cell a is e
  s = c | c;s


 define a function tht computes the locations (Int,Int) contained in a sheet s.

 hint: implement the above grammars as data types in haskell........