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started a subdir for the book

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aarne
2010-11-22 12:55:37 +00:00
parent 8ab5ec00c6
commit 46137ab6a6
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14
book/examples/chapter8/CalculatorP.gf Normal file
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concrete CalculatorP of Calculator = open Prelude in {
lincat
Exp = SS ;
lin
EPlus = infix "+" ;
EMinus = infix "-" ;
ETimes = infix "*" ;
EDiv = infix "/" ;
EInt i = i ;
oper
infix : Str -> SS -> SS -> SS = \f,x,y ->
ss ("(" ++ x.s ++ f ++ y.s ++ ")") ;
}