Title: How to check if an Italian Fiscal Code is valid.
Question: A simple function that asks a Fiscal Code (16 digits) and calculates if it's valid. Returns a boolean value.
Answer:
Just use this and specify in the parameter the Fiscal Code you want to test.
Function VerifyCodFisc( Code : String ) : Boolean;
Var
tmpInt : Integer;
IdX : Integer;
AppoNum : Integer;
CheckDigit : String;
Begin
tmpInt := 0;
IdX := 1;
Code := UpperCase( Code );
Repeat
AppoNum := Pos( Copy( Code, IdX, 1 ), 'B1A0KKPPLLC2QQD3RRE4VVOOSSF5TTG6UUH7MMI8NNJ9WWZZYYXX' );
tmpInt := tmpInt + ( ( AppoNum - 1 ) And ($7FFE) ) Div 2;
Inc( IdX );
If ( IdX 15 ) Then Break;
AppoNum := Pos( Copy( Code, IdX, 1 ), 'A0B1C2D3E4F5G6H7I8J9KKLLMMNNOOPPQQRRSSTTUUVVWWXXYYZZ' );
tmpInt := tmpInt + ( ( AppoNum - 1 ) And ($7FFE) ) Div 2;
Inc( IdX )
Until ( Code = '' ); // Infinite loop, exits with the Break instruction.
tmpInt := tmpInt Mod 26;
CheckDigit := Copy( 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', ( tmpInt + 1 ), 1 );
If ( CheckDigit = Code[ Length( Code ) ] ) Then
Result := True
Else
Result := False;
End;