Roland Schilling wrote: > >OK, but that is something I already had in mind. If I print >the to values to be compared with the format f24.20 I get > 4.00000000000000000000 4.00000000000000000000 >i.e. 20 zeros after the digital point! > > > Try to print a-10.*b and you'll see the difference due to the inaccurate representation of 0.4. In my experience, what you get with an F24.20 format may correspond to some rounding of the exact decimal conversion of the variable, although I am not sure if there is any contstraint on this behavior in the standard. Giorgio Pastore