Pascal (programming language): Difference between revisions

Revision as of 10:03, 26 January 2024

Revision as of 20:08, 26 January 2024

Line 200:

Subranges of any [[ordinal data type]] (any simple type except real) can also be made:

:<syntaxhighlight lang="pascal">

:

var

x : 1..10;

y : 'a'..'z';

</syntaxhighlight lang="pascal">

===Set types===

Line 222 ⟶ 226:

if (i > 4) and (i < 11) then ...

</syntaxhighlight>

<syntaxhighlight lang="pascal">

var

x : 1..10;

y : 'a'..'z';

</syntaxhighlight>Sets of non-contiguous values can be particularly useful, in terms of both performance and readability:

</syntaxhighlight>Sets of non-contiguous values can be particularly useful, in terms of both performance and readability:

:

:<syntaxhighlight lang="pascal">

if i in [0..3, 7, 9, 12..15] then ...

</syntaxhighlight>

For these examples, which involve sets over small domains, the improved performance is usually achieved by the compiler representing set variables as [[bit vector]]s. The set [[Operator (programming)|operators]] can then be implemented efficiently as bitwise machine code operations.

===Record types===

<syntaxhighlight lang="pascal">

if i in [0..3, 7, 9, 12..15] then ...

</syntaxhighlight>An example of a Pascal record type:

</syntaxhighlight>An example of a Pascal record type:

:

:<syntaxhighlight lang="pascal">

type

car = record

length: integer;

width: integer

end;

</syntaxhighlight>

An example of a variant record type: