Difference between revisions of "Records"
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Revision as of 22:16, 25 November 2007
5E - Records (author: Tao Yue, state: unchanged)
A record allows you to keep related data items in one structure. If you want information about a person, you may want to know name, age, city, state, and zip.
To declare a record, you'd use:
TYPE TypeName = record identifierlist1 : datatype1; ... identifierlistn : datatypen; end;
type InfoType = record Name : string; Age : integer; City, State : String; Zip : integer; end;
Each of the identifiers Name, Age, City, State, and Zip are referred to as fields. You access a field within a variable by:
A period separates the variable and the field name.
There's a very useful statement for dealing with records. If you are going to be using one record variable for a long time and don't feel like typing the variable name over and over, you can strip off the variable name and use only field identifiers. You do this by:
WITH RecordVariable DO BEGIN ... END;
with Info do begin Age := 18; ZIP := 90210; end;