Hi, Perhaps I'm missing something, but I haven't found an answer to this question in the textbook I have been using (Thompson) or through Google/Hoogle: can a String include Unicode characters? For instance, if I am defining an instance of Show Expr, where Expr models simple arithmetic expressions (or Show Seq, where Seq models a sequent calculus, and so forth), could I define a function *show Pi* = U+03C0 or *show Delta* = U+0395? Perhaps the answer is obvious, but I haven't been able to find it.
On Wednesday 28 July 2010 23:43:01, dan portin wrote:
Hi,
Perhaps I'm missing something, but I haven't found an answer to this question in the textbook I have been using (Thompson) or through Google/Hoogle: can a String include Unicode characters?
Yes. A Char is a unicode code-point.
For instance, if I am defining an instance of Show Expr, where Expr models simple arithmetic expressions (or Show Seq, where Seq models a sequent
Don't call it Seq, that's already used for sequences in Data.Sequence.
calculus, and so forth), could I define a function *show Pi* = U+03C0 or
You need a different syntax, show Pi = "\x03C0"
*show Delta* = U+0395?
show Delta = "\x0394"
Perhaps the answer is obvious, but I haven't been able to find it.
However, if your locale is not utf-8 or you're using a pre-6.12 GHC, output might be garbled, then you'd have to use System.IO.UTF8.putStrLn to print.
participants (2)
-
dan portin -
Daniel Fischer