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case

Synopsis


case expression of
  selector: statement;
  ...
  selector: statement;
end;
or, with alternative statement sequence:
case expression of
  selector: statement;
  ...
  selector: statement;
otherwise  { ``else'' instead of ``otherwise'' is allowed }
  statement;
  ...
  statement;
end;
or, as part of the invariant record type definition:
foo = record
  field_declarations
case bar: variant_type of
  selector: (field_declarations);
  selector: (field_declarations);
  ...
end;
or, without a variant selector field,
foo = record
  field_declarations
case variant_type of
  selector: (field_declarations);
  selector: (field_declarations);
  ...
end;

Description

case opens a case statement. For further description see case Statement.

For case in a variant record type definition, see Record Types.

Conforming to

The case statement is defined in ISO 7185 Pascal and supported by all known Pascal variants.

According to ISO 7185 Pascal, the selector type must be a named type. UCSD Pascal and Borland Pascal allow any ordinal type here.

The alternative statement execution with otherwise it is an Extended Pascal extension; with else it is a Borland Pascal extension. In GNU Pascal, both are allowed.

Example


program CaseDemo;
var
  Foo: String (10);
  Bar: Integer;
begin
  WriteLn ('Enter up to ten arbitrary characters:');
  ReadLn (Foo);
  for Bar := 1 to Length (Foo) do
    begin
      Write (Foo[Bar], ' is ');
      case Foo[Bar] of
        'A' .. 'Z', 'a' .. 'z':
          WriteLn ('an English letter');
        '0' .. '9':
          WriteLn ('a number');
      otherwise
        WriteLn ('an unrecognized character')
      end
    end
end.

See also

Keywords, if Statement, Record Types, else, otherwise