Difference between revisions of "Record"
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{{Record}} | {{Record}} | ||
− | A highly structured data [[Type|type]] in [[Pascal]] . | + | A '''record''' is a highly structured data [[Type|type]] in [[Pascal]] . |
While simple data structures such as [[Array|arrays]] or sets consist of elements all of the same type, a record can consist of a number of elements of different types, and can take on a huge complexity. Each separate part of a record is referred to as a Field. | While simple data structures such as [[Array|arrays]] or sets consist of elements all of the same type, a record can consist of a number of elements of different types, and can take on a huge complexity. Each separate part of a record is referred to as a Field. | ||
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Records are widely used in Pascal, to group data items together logically. | Records are widely used in Pascal, to group data items together logically. | ||
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+ | {{Data types}} |
Revision as of 21:41, 27 April 2013
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A record is a highly structured data type in Pascal .
While simple data structures such as arrays or sets consist of elements all of the same type, a record can consist of a number of elements of different types, and can take on a huge complexity. Each separate part of a record is referred to as a Field.
Some examples of records:
Type
ExampleRecord = Record
Values: array [1..200] of real;
NumValues: Integer; { holds the actual number of points in the array }
Average: Real { holds the average or mean of the values in the array }
End;
Member = Record
Firstname, Surname : string;
Address: array [1..3] of string;
Phone : Integer;
Birthdate: TDateTime;
PaidCurrentSubscription: Boolean
End;
A record is treated by the program as a single entity, and for example a whole record can be copied (provided the copy is of the same type) thus:
Var a, b : Member;
Begin
{ assign values to the fields in Record a }
...
...
b := a
End;
Individual fields are accessed by placing a dot between the record name and the field name thus:
a.firstname := 'George';
a.surname := 'Petersen';
a.phone := 789534;
a.PaidCurrentSubscription := TRUE;
Alternatively, the whole series of fields can be made available together using the WITH construct:
with a
do
begin
firstname := 'George';
surname := 'Petersen';
phone := 789534;
PaidCurrentSubscription := TRUE
end;
Records are widely used in Pascal, to group data items together logically.
simple data types |
|
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complex data types |