Greetings, I am running GPC under RedHat 7.3 on an Intel i686. I am trying to debug a MatLab program by running it against one written in Gnu Pascal. I am using the type longreal throughout. According to the manual this typically occupies 80 bits. Is there any way of finding out easily how long longreal is on my hardware? I want to avoid precision-related problems. The programs generate much the same output but depart beyond about 7 significant figures. Thanks in advance for information and advice. John O.