Difference between revisions of "Raise"
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| + | == see also == | ||
| + | |||
| + | * [[Try| <syntaxhighlight lang="pascal" enclose="none">try</syntaxhighlight>]]..[[Finally|<syntaxhighlight lang="pascal" enclose="none">finally</syntaxhighlight>]] [[Block|block]]. | ||
| + | * [[Try| <syntaxhighlight lang="pascal" enclose="none">try</syntaxhighlight>]]..[[Except|<syntaxhighlight lang="pascal" enclose="none">except</syntaxhighlight>]] block. | ||
| + | * [[On| <syntaxhighlight lang="pascal" enclose="none">on</syntaxhighlight>]] | ||
| + | * [[runtime error|run-time error]] | ||
Revision as of 08:51, 27 April 2019
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The reserved word raise is used to explicitly throw an exception.
The raise statement stops normal execution and transfers control to an exception handler.
summary briefly
- belongs to object-oriented programming
- cause an exception
example
program Example1;
uses sysutils;
function titleread(a_title:string):string;
var
answer:string;
begin
writeln ( a_title);
readln(answer);
if answer = '' then raise Exception.Create('Variable has no value');
result := answer;
end;
var
firstname,lastname:string;
begin
firstname := titleread( 'Write your first name:');
lastname := titleread( 'Write your last name:');
writeln ('your name is ', firstname, ' ', lastname);
readln;
end.
