Re: Linux printf funny

In comp.arch.embedded,
Paul Burke <paul@xxxxxxxxxx> wrote:
I'm converting an application from Windows console to Linux, and the
changeover has gone remarkably easily (considering that I know very
little about Linux), until now.

Is this a win32 console application or an old DOS application?

No problem installing GCC, KDevelop, FTDI USB drivers, remarkably few
changes to recompile the code... but printf fails after about
half-a-dozen calls. A float value prints as "nan"- not a number I asume,
rather than what I eat with an Indian takeout. This value is computed
from two int values (actually a weight and a tare reading) and
multiplied by a scale factor (1.0 for the tests).

The funny thing is that I can't see anything different about the weight
or the tare value between instances that print and those that fail.
There is the expected one-or-two bits wobble in the weight reading, but
the values only oscillate between plus and minus one relative to the
tare. Once it fails, it seems to be sticky- it doesn't recover even when
the readings are identical to before the nan.

So, please you Linux/ GCC experienced people- what absolutely basic item
of knowledge am I lacking?

It does not sound like a windows/linux problem, but more like a
programming error. So please show us the code.

I know I found some errors in old DOS (turbo C) test programs when I
ported them to new versions of compilers (windows or linux). These
programs worked normally using the old compiler but failed using a
newer one. All the errors where my own (beginners)fault: uninitialized
vars, wrong format specifiers, near/far pointer stuff etc.


--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)

.

Relevant Pages

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