<html> <head> <style></style></head> <body class='hmmessage'><div dir='ltr'><div>> Perhaps 0x1p-16?</div><div><br></div><div>I think that is ok. I am not an expert in rounding (although I did some numerical work in fortran and ratfor in the late 70's) or in calculating ppm sizes.</div><div><br></div><div>It is always necessary to round up? For example, if it comes out to 100.01, can it return 100 or does it have to be 101?</div><div><br>> I know C better than C++. Does C++ already have a routine for this?<br><br></div><div>I'm in the same category with C vs. C++.</div><div><br></div><div>William</div><div><br></div> </div></body> </html>