freepascal.compiler/docs/sysutex/ex53.pp

Program Example53;

{ This program demonstrates the AnsiLowerCase function }

Uses sysutils;

Procedure Testit (S : String);

begin
 Writeln (S,' -> ',AnsiLowerCase(S))
end;

Begin
  Testit('AN UPPERCASE STRING');
  Testit('Some mixed STring');
  Testit('a lowercase string');
End.