Re: [Gawk] Bug in arithmetic comparisons

[John Cowan]

Seb scripsit:

> I think there is a bug in the comparisons that gawk (3.1.8) makes in numeric
> context. Here is an example of what I get :
> 
> $ echo "12.10 12.10" | awk 'BEGIN{print ($1 == $2) ? 1 : 0}'
>   1
> $ echo "12.10 12.1" | awk 'BEGIN{print ($1 == $2) ? 1 : 0}'
>   1
> $ echo "12.10 12.1" | awk 'BEGIN{print ($1 == $2+0) ? 1 : 0}'
>   0

Because you are inside a BEGIN block, the $1 and $2 variables are not yet
set to anything, so you are comparing '' to '' in the first two examples,
and '' to '0' in the third.  If you omit the BEGIN, you get 1 in each
example, as expected.

-- 
Only do what only you can do.               John Cowan <address@hidden>
  --Edsger W. Dijkstra's advice
    to a student in search of a thesis