Difference between revisions of "Case"
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* [[Dialog_Examples#ShowMessage|ShowMessage]] | * [[Dialog_Examples#ShowMessage|ShowMessage]] | ||
* [[Type]] | * [[Type]] | ||
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+ | [http://www.prlog.org/11289974-phone-number-lookup-verizon-phone-number-reverse-lookup-to-get-information-you-need-quickly.html reverse lookup] | ||
+ | |||
+ | [http://thetvtopc.com/Reverse_Cell_Phone_Lookup_Number reverse phone lookup cell] |
Revision as of 19:43, 2 January 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.
<delphi>
case place of 1: ShowMessage('Gold medal'); 2: ShowMessage('Silver medal'); 3: ShowMessage('Bronze medal'); else ShowMessage('Better luck next time'); end;
</delphi>
WhatIsChar
<delphi>
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;
</delphi>
Variant Record
Case-word is used Variant Record, too. Variant Record also called a tagged union.
<delphi>
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;
</delphi>