On Mon, 19 Apr 2010 16:36:06 +0100 Howard Page-Clark <h...@talktalk.net> wrote:
> On 19/4/10 3:50, spir ☣ wrote: > > Hello, > > > > Total Pascal newbie here. Looked for answers in various references and > > tutorials, but cannot find. > > > > Fore-question: Is there a (free)pascal teaching/learning mailing list? > > (Like python's "tutor" list.) If not, is this one a proper place? > > > > * How does one declare the type of set items? > > numbers : Set of Integer // error > > > type > Tbyteset = set of byte; > > > * How does one define the _value_ of a Set or Array? > > numbers := (1,2,3) // error > > numbers := [1,2,3] // error > > var > byteset : Tbyteset; > > begin > byteset := []; // empty set > byteset := [0, 3, 101]; // puts literal values into the set > Include(byteset, 27]; // or byteset := byteset + [27]; > Exclude(byteset, 3); // or byteset := byteset - [3]; > end; > > Note that set types are limited to 256 elements of ordinal types > (integer, char or enumeration). > > Howard Thank you. Does this mean that to be able to define a literal value like "byteset := [0, 3, 101]" for a set (and probably for an array) I must have defined a custom type for it; correct? (It's the only difference I see with my trials: numbers in my code is not of a custom type but simply a var of type "Set of Integer".) What I mean is, if the value is a literal, instead of only declaring the var then defining its value, one must first make a custom type for it? I don't understand the need & purpose of custom types except for records & enums; but this may be caused by the fact I come from dynamic languages. Denis ________________________________ vit esse estrany ☣ spir.wikidot.com _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
