On Sat, 21 Jun 2008, Xiao-Yong Jin wrote:
Hi, I'm wondering how usually you parse command line arguments list safely. If the given argument is wrong, the program can still print out some error information instead of giving something like Prelude.read: no parse
It's generally not a good idea to call 'read' on user data. 'read' expects well-formed input. Calling 'read' with other input is a programming _error_. If the user enters garbage, this is an _exception_ and this must be handled with 'reads' or 'maybeRead' as others suggested.
http://www.haskell.org/haskellwiki/Error http://www.haskell.org/haskellwiki/Exception _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
