Difference between revisions of "Begin"
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| − | + | {{Begin}} | |
| − | + | The [[Reserved word|reserved word]] <syntaxhighlight lang="pascal" inline>begin</syntaxhighlight> marks the start of the definition of the executable portion of a [[Block|block]]. | |
| + | In conjunction with [[End|<syntaxhighlight lang="pascal" inline>end</syntaxhighlight>]] it is also used to group [[statement]]s into a so-called “compound statement”. | ||
| − | + | {{Note|In [[Pascal]] a compound statement does not create a new scope. | |
| − | + | Only blocks do.}} | |
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| − | + | In [[Extended Pascal|extended Pascal]] <syntaxhighlight lang="pascal" inline>to begin do …</syntaxhighlight> starts the definition of the [[Initialization|<syntaxhighlight lang="pascal" inline>initialization</syntaxhighlight> part of a module]]. | |
| − | <syntaxhighlight> | + | While every <syntaxhighlight lang="pascal" inline>begin</syntaxhighlight> must have a corresponding <syntaxhighlight lang="pascal" inline>end</syntaxhighlight>, not all occurrences of <syntaxhighlight lang="pascal" inline>end</syntaxhighlight> have a corresponding <syntaxhighlight lang="pascal" inline>begin</syntaxhighlight>. |
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| − | </syntaxhighlight> | ||
| − | + | == syntax justification == | |
| + | Lots of programming languages use a pair of single characters to indicate boundaries. | ||
| + | Typing out the words <syntaxhighlight lang="pascal" inline>begin</syntaxhighlight> and <syntaxhighlight lang="pascal" inline>end</syntaxhighlight> is indeed more cumbersome than writing <syntaxhighlight lang="c" inline>{ }</syntaxhighlight>. | ||
| + | However, the meaning of such characters is not as obvious as words are. | ||
| + | |||
| + | == matching == | ||
| + | * The source editor of the [[Lazarus IDE]] supports a “find matching begin/end” function. | ||
| + | * [[vim#navigation|vim]] can be configured to support matching Pascal’s <syntaxhighlight lang="pascal" inline>begin</syntaxhighlight>/<syntaxhighlight lang="pascal" inline>end</syntaxhighlight>, too. | ||
{{Keywords}} | {{Keywords}} | ||
Latest revision as of 22:52, 21 August 2021
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The reserved word begin marks the start of the definition of the executable portion of a block.
In conjunction with end it is also used to group statements into a so-called “compound statement”.
Note: In Pascal a compound statement does not create a new scope. Only blocks do.
In extended Pascal to begin do … starts the definition of the initialization part of a module.
While every begin must have a corresponding end, not all occurrences of end have a corresponding begin.
syntax justification
Lots of programming languages use a pair of single characters to indicate boundaries.
Typing out the words begin and end is indeed more cumbersome than writing { }.
However, the meaning of such characters is not as obvious as words are.
matching
- The source editor of the Lazarus IDE supports a “find matching begin/end” function.
- vim can be configured to support matching Pascal’s
begin/end, too.
Keywords: begin — do — else — end — for — if — repeat — then — until — while
