[fpc-pascal] newbie questions
denis.spir at gmail.com
Mon Apr 19 21:44:00 CEST 2010
On Mon, 19 Apr 2010 16:36:06 +0100
Howard Page-Clark <hdpc at 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
> 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
> byteset : Tbyteset;
> byteset := ; // empty set
> byteset := [0, 3, 101]; // puts literal values into the set
> Include(byteset, 27]; // or byteset := byteset + ;
> Exclude(byteset, 3); // or byteset := byteset - ;
> Note that set types are limited to 256 elements of ordinal types
> (integer, char or enumeration).
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.
vit esse estrany ☣
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