Difference between revisions of "Var"
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== Variable declaration section == | == Variable declaration section == | ||
− | In a [[Block|block]] the word <syntaxhighlight lang="pascal" inline>var</syntaxhighlight> starts a section of one or more variable declarations. | + | In a [[Block|block]] the word <syntaxhighlight lang="pascal" inline>var</syntaxhighlight> starts a section of one or more variable [[Declaration|declarations]]. |
<syntaxhighlight lang="pascal" highlight="1"> | <syntaxhighlight lang="pascal" highlight="1"> | ||
var | var |
Latest revision as of 22:14, 4 July 2021
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The keyword var
is used to:
- start section of variable declarations, and
- declare a formal parameter as penetrating mutable.
Variable declaration section
In a block the word var
starts a section of one or more variable declarations.
var
age: integer;
Variables bearing the same data type can be grouped, by separating their respective identifiers by a comma:
var
firstName, lastName, address: string;
Variable parameter
The word var
prior a formal parameter declaration indicates that this parameter is variable, that means assigning values to it will affect the named parameter at the call site.
procedure censor(var xxx: longWord);
begin
if (xxx = $4655434B) or (xxx = $6675636B) then
begin
xxx := $2A2A2A2A;
end;
end;
After invoking procedure censor
the value of the variable that was supplied at the call site (i. e. where the procedure was called) will (possibly) have changed, too.