gawk malcfunctioning

[Maite Merino]

Hello,

I'm novice in this topics and very far away from suitables gurus, so 
forgive me if I'm telling you something ridiculous or stupid here, but 
I think I've detected a posible bug in gawk v.3.1.4.

I have some very simple scripts that make some calculations reading 
from a 1-column list of floats (p.ej fwhm.lst).
In machines with gawk 3.1.2 and gawk3.1.3 that worked perfectly, but 
in gawk 3.1.4 it gives me stupid results in two diferents machines.
> From printsf I've detected that the problew is because even putting 
explicitelly CONVFMT="%.6g", when it does:
BEGIN { s=1.0
...
}
...
END {
...
s+=$1
...
}

in the part with s+=$1 results that if p.ex. $1=2.98 in that line, it 
adds to s only 2.00, id. est., when it transform from string to float, 
it makes truncation. And even using the CONVFMT="%.6g" and 
strtonum($1) still is making truncation every time.
That makes that all the calculation results are wrong!!!

i've tried to desinstall gawk to install again an older version, but 
it has not worked. And I'm currently working on dayly basis on some 
very old and complex soft that in the past crashed when I updated the 
kernel so I'm not going to risk agin touching the system.

I've installed mawk and works perfectly without any truncation 
problem.

So, my questions are the following:
        -Can you reproduce that posible bug onto other gawk 3.1.4?
        -If so, it was a known bug?
	-Can I solve that truncation withour risk at all (not 
touching system nor kernel)?

Thanks,

Maite