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4.4 Initialized variables

By default, variables in Pascal are not initialized after their declaration. Any assumption that theycontain 0 or any other default value is erroneous: They can contain rubbish. To remedy this,the concept of initialized variables exists. The difference with normal variables is thattheir declaration includes an initial value, as can be seen in the diagram in the previoussection.

A record is a highly structured data type in Pascal. They are widely used in Pascal, to group data items together logically. While simple data structures such as array s 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. You can use either one of following constructs (where Foo is a record). Fill memory with character data or just use it to initialize memory with some given byte.

It is incorrect for cornets and other instruments. Selmer started making trumpets in 1931 after buying out Millerau.French Cornet EstimateNumberYear981980Factory Confirmed serials:Cornet 1162 made in 1957.

Given the declaration:

Var
S : String = ’This is an initialized string’;

The value of the variable following will be initialized with the provided value. The following is aneven better way of doing this:

Const
SDefault = ’This is an initialized string’;
Var
S : String = SDefault;

Initialization is often used to initialize arrays and records. For arrays, the initialized elements mustbe specified, surrounded by round brackets, and separated by commas. The number of initializedelements must be exactly the same as the number of elements in the declaration of the type. As anexample:

Var
tt : array [1.3] of string[20] = (’ikke’, ’gij’, ’hij’);
ti : array [1.3] of Longint = (1,2,3);

For constant records, each element of the record should be specified, in the form Field: Value,separated by semicolons, and surrounded by round brackets. As an example:

Type
Point = record
X,Y : Real
end;
Var
Origin : Point = (X:0.0; Y:0.0);

The order of the fields in a constant record needs to be the same as in the type declaration,otherwise a compile-time error will occur.

Remark: It should be stressed that initialized variables are initialized when they come into scope, indifference with typed constants, which are initialized at program start. This is also true for localinitialized variables. Local initialized variables are initialized whenever the routine is called. Anychanges that occurred in the previous invocation of the routine will be undone, because they areagain initialized.

Initializing arrays of record.

Hello everybody.

How can I initialize an array of records, like

# type
# Example = record
# id : integer;
# content: string
# end;
#
# var
#
# ExampleArray : array[1.N] of Example;

Can I initialize the array in the 'var' section?
I tried something like the following in Delphi, but it doesn't work:

ExampleArray : array[1.N] of Example = ( (1, 'example 1'), (2, 'example
2'), .., (N, 'example N'));

Can it be done? Probably my syntax interpretation is wrong, but I have no
Pascal books at hand, and I don't want to do it in the main code, like

ExampleArray[1].id := 1;
ExampleArray[2].content := 'example 1';
etc..

Any help would appreciated
TIA

----------------------
Pierre Leon

pjl..@arrakis.es
aulad..@tsc.es
---------------------------

Re:Initializing arrays of record.

Quote

Pierre Leon wrote:

[..]

Quote

> # type
> # Example = record
> # id : integer;
> # content: string
> # end;
> # var
> # ExampleArray : array[1.N] of Example;
> Can I initialize the array in the 'var' section?
> I tried something like the following in Delphi, but it doesn't work:
> ExampleArray : array[1.N] of Example = ( (1, 'example 1'), (2, 'example
> 2'), .., (N, 'example N'));

There is only one little thing you forgot (at least for BP, don't know Delphi):
to declare a initialised record constant, you have to precede each field value by
the field identifier, in your case:

ExampleArray : ARRAY[1.N] OF Example = ( (id: 1; content : 'example 1'),..);

Also, note the semi-colons separating the fields (instead of commas).

Good luck,

Remco

--
Remco Vietor Department of Chemistry
re..@chem.gla.ac.uk J. Black Building
University of Glasgow
Glasgow G12 8QQ
U.K.

Re:Initializing arrays of record.

On 25 Aug 97 15:55:19 GMT, 'Pierre Leon' <pjl..@arrakis.es> wrote:

Quote

>Hello everybody.
>How can I initialize an array of records, like
># type
># Example = record
># id : integer;
># content: string
># end;
>#
># var
>#
># ExampleArray : array[1.N] of Example;
>Can I initialize the array in the 'var' section?
>I tried something like the following in Delphi, but it doesn't work:
>ExampleArray : array[1.N] of Example = ( (1, 'example 1'), (2, 'example
>2'), .., (N, 'example N'));
>Can it be done? Probably my syntax interpretation is wrong, but I have no
>Pascal books at hand, and I don't want to do it in the main code, like
>ExampleArray[1].id := 1;
>ExampleArray[2].content := 'example 1';
>etc..
>Any help would appreciated
>TIA

Hello
you can initialize only CONST array and not that ones in the VAR
section.
the way you initialize the array above can be done only with CONST
arrays.

Bye
Andrea

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