Difference between revisions of "Block"
From Free Pascal wiki
Jump to navigationJump to searchm (Fixed template loop) |
m (Categorised page) |
||
Line 27: | Line 27: | ||
== see also == | == see also == | ||
* [[Comments#block comments|block comments]] | * [[Comments#block comments|block comments]] | ||
+ | |||
+ | [[Category:Code]] | ||
+ | [[Category:Pascal]] |
Revision as of 07:14, 27 December 2019
│ English (en) │
A block is a sequence of declarations followed by a sequence of statements.
The declarations are optional.
The sequence of statements can be empty, but at least the begin
…end
-frame has to be present (in routines asm
…end
is allowed, too).
The key feature of a block is, that declarations are only valid while the statements are processed.
This concept is known as scope.
Example
The following is a valid block:
const
foobar = -1;
type
booleanArray = array of boolean;
var
check: booleanArray;
begin
check := booleanArray.create(true, false, true);
end;
An indication, whether something constitutes a block, is, whether you can use it as part of a routine definition, as well as make a program
out of it (syntactically; apart from the terminating dot).