thx for the typo fixes indeed, it's exactly BCD arithmetics which are part of the standard, with fixed decimal size and comma position and yes, Turbo Pascal

thx for the typo fixes indeed, it's exactly BCD arithmetics which are part of the standard, with fixed decimal size and comma position and yes, Turbo Pascal had some limited support for them. you needed them in the 1990s for data exchange with banks in Germany. "Datenträgeraustauschformat". data storage exchange format. one of my first coding gigs was automatic collection of membership fees. the checksum for the data file was the sum of all bank account numbers and the sum of all bank ID numbers (and the sum of all transferred amounts)... trivial in Cobol. not so much in Turbo C++ :-) I wasn't aware of the BCD in turbo Pascal... those were the days :-D