read_token works for me for my particular problem (only positive numbers), thanks! I use http://eclipseclp.org/doc/bips/fullindex.html and I saw read_token/2 and read_token/3 before, but for some reason I decided that these predicates can't do what I need. In a case of signed numbers 3 strings look like a lot for this mundane task. It can be combined to a custom predicate, but why there is no a standard utility predicate for this? Sergey. On Wed, Sep 21, 2011 at 10:14 PM, Joachim Schimpf <jschimpf_at_...311...> wrote: > Kish Shen wrote: >> On 21/09/2011 18:22, Sergey Dymchenko wrote: >>> Sorry for probably stupid question, but I can't find an answer. >>> >>> How to read an integer from user? >>> read(N) requires user to end input with dot, >>> read_line(N) returns a string, not an integer... >>> >>> Sergey. >>> > > >> Hi, >> >> If you use ECLiPSe's help/1 with the query "help read.", this would give >> you a list of all builtins whose name has read in it (a predicate that >> provides the functionality you want is likely to have read as part of >> its name), including >> >> read_token/2 and read_token/3, which is probably what you want - call it >> with Class set to integer: >> >> read_token(stream, X, integer) >> > > > In Sergey's case, a better choice might be the combination > > read_string(Stream, end_of_line, _, String), > number_string(X, String), > integer(X) > > because (unlike read_token) it handles negative numbers and > it will fail if there are any junk characters after the number > (read_token would just leave these unread). > > > -- Joachim > > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2dcopy1 > _______________________________________________ > ECLiPSe-CLP-Users mailing list > ECLiPSe-CLP-Users_at_lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/eclipse-clp-users >Received on Wed Sep 21 2011 - 19:28:51 CEST
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