Computer Science Canada

Another Record Error
Author:  Justin_ [ Fri Jan 20, 2006 6:39 am ]
Post subject:  Another Record Error
code:

    var website : flexible array 1 .. 1 of
        record     %struct equivelant
            url_list    : array 1 .. 20 of string
            %turing doesn't support flexible arrays within records.
            search_found  : int
            url_count     : int :=0     %To determine how many links there are.
         %   url         : string
            file_stream   : int
            netStream     : int
            urlNum        : int := 0
        end record


I'm getting an error, it highlights ":=o" for both urlNum and url_count. Does this mean I'm initializing my record variables incorrectly?
Author:  Delos [ Fri Jan 20, 2006 9:06 am ]
Post subject: 
The elements in a record cannot be initialized directly. They are basically descriptions of what the variable will contain. You wouldn't want to initialize them right away anyway - that wouldn't be fun.

You should, however, create a function to initialize them:

code:

type myType :
   record
      name : string
      number : int
      face : string
   end record

function init_MT (inName : string, inNum : int, inFace : string) : myType
   var temp : myType
   temp.name := inName
   temp.number := inNum
   temp.face := inFace
   result temp
end init_MT

% Alternatively, if you do want certain fields to automatically be initialized to a certain value:
function init_MT_def (inName : string) : myType
   var temp : myType
   temp.name := inName
   temp.number := 5
   temp.face := "Sad"
   result temp
end init_MT_def
Author:  Martin [ Fri Jan 20, 2006 9:14 am ]
Post subject: 
If you know how to use them, a class is a better solution than using a record.
Author:  Justin_ [ Fri Jan 20, 2006 11:24 am ]
Post subject: 
Yeah well, my record just so happens to be used in a flexible array, so I really can't see it being too efficient having to initilaize every element inside the array IF it gets created.

I wish i knew about classes if they could help.
Author:  Delos [ Fri Jan 20, 2006 11:48 am ]
Post subject: 
Read Cervantes Tut on it. It's a long haul, but it will introduce you and guide you through a fair deal.
Author:  Cervantes [ Fri Jan 20, 2006 5:11 pm ]
Post subject: 
The other way of doing it is:
code:

var my_coord2d :
    record
        x, y : int
    end record
    := init (5, 7)


I'm fairly certain the above works, though I doubt if it would work on types:
code:

type coord2d :
    record
        x, y : int
    end record
    := init (5, 7)
var my_coord2d : coord2d

I highly doubt that would work, but it's worth a try. This calls for a new acronym: NOWNOW Not on Windows now

But yes: objects. Smile

:


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