Support of log10?

[Peng Yu]

$ seq 3 | awk -v 'OFS=\t' -v OFMT=%.20g -e 'function log10(x) { return
log(x)/log(10); } { print "log10(" 10^$1 ")", log10(10^$1) }'
log10(10)       1
log10(100)      2
log10(1000)     2.9999999999999995559

I don't find a native support of log10(). But if I implement log10
with log, I got the above problem. The result of log10(1000) should be
exact 3. But it is not.

Is it worthwhile to consider the support of log10 in gawk?

-- 
Regards,
Peng