comma dot inconsistancy in gawk

[Heinrich Vollmers]

There seems to be some inconsistancy and error when applying gawk which 
did not appear in older versions (3.1.1):

gawk -v dx=1.026 -v b=-3.29102e-05 'BEGIN{a=0.000602917;print 
b*dx+a,a,b,dx;}'
-3,37659e-05 0 -3.29102e-05 1.026

gawk --version
GNU Awk 3.1.3
System: Linux SUSE 9.0

With kind regards

Heinrich Vollmers