On Wed, Mar 23, 2016 at 8:26 AM, WarGrey Gyoudmon Ju <[email protected]> wrote:
> In Racket, (read) and (write) know all the builtin datatypes > <https://docs.racket-lang.org/reference/reader.html?q=readtable#%28part._parse-number%29> > which > are already structured more than a stream of bytes (like in C). > Thus, you don't need scanf to tell Racket what is the type of the next > token. > > That *is* painful in a situation like coding challenges since the input > format is language independent (however actually it's the C style). > Of course this kind of situation also has its own fixed format, you can > define your own read tables > <https://docs.racket-lang.org/reference/readtables.html?q=readtable> : > 1. the "," is special in Racket, you need to drop off them first; > (with-input-from-string > "[04 foo 03.5]" read) gives you '(4 foo 3.5) directly. > 2. Symbols are internal Strings, you need (symbol->string) to covent them > into normal Strings (Yes, sometimes, I think if there are string-like or > bytes-like APIs that work on symbols directly). > > Sorry, please forget the Read Table, it makes things more complex here. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
