Difference between revisions of "Case"
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case place of | case place of | ||
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end; | end; | ||
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=== WhatIsChar === | === WhatIsChar === | ||
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function WhatIsChar( c:char ):string; | function WhatIsChar( c:char ):string; | ||
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end; | end; | ||
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== Variant Record == | == Variant Record == | ||
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Case-word is used Variant [[Record]], too. Variant Record also called a tagged union. | Case-word is used Variant [[Record]], too. Variant Record also called a tagged union. | ||
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type | type | ||
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end; | end; | ||
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== Read more == | == Read more == | ||
Revision as of 14:57, 24 March 2012
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Case opens a case statement. The case statement compares the value of ordinal expression to each selector, which can be a constant, a subrange, or a list of them separated by commas. Selector field separated from action field by Colon.
The case statement includes reserved words Of and End . Sometimes Else, too.
case place of
1: ShowMessage('Gold medal');
2: ShowMessage('Silver medal');
3: ShowMessage('Bronze medal');
else ShowMessage('Better luck next time');
end;WhatIsChar
function WhatIsChar( c:char ):string;
var
s : string;
begin
s := '';
case c of
'0' .. '9' : s := 'digit (0-9)';
'a' .. 'z' : s := 'small letter (a-z)';
'A' .. 'Z' : s := 'big letter (A-Z)';
'+' , '-' : s := 'sign (+ or -)';
end;
result := s;
end;Variant Record
Case-word is used Variant Record, too. Variant Record also called a tagged union.
type
ScaleKelvin = 223 .. 323;
ScaleCelsius = -50 .. 50;
TemperatureScale = ( celcius, kelvin ) ;
Temperature = record
case scale : TemperatureScale of
celcius : (celcius_value : ScaleCelsius);
kelvin : (kelvin_value : ScaleKelvin);
end;