Hi, In order to make IBAN checksum checker I need to make modulo 97 operation on a very high value that cannot be stored in int or count type. Is there any way I could make this possible? there is no 'long' type in bro? This is exactly what I'm tring to accomplish: http://www.ibancalculator.com/calculation.html -- Pozdrawiam Sławomir Rozbicki