attribution of ++ to the wrong variable in "a ++b"

[Pascal Maugis]

Hi, as promised here is the strange, unexpected behavior of ++ that 
looks like an error to me, because in "a ++b", a is incremented instead 
of b. "a b++" and "a++ b" produce the correct results however :

   touch a.awk
   gawk -D -f ./a.awk
   eval "a=1 ; b=2"
   eval "print a ++b"   ; output = 12 : (variables will be incremented
   after the operation, ok with me as documented)
   eval "print a b"     ; output = 22 : a has been incremented instead of b
   eval "print a++b"    ; output = 22 :
   eval "print a b"     ; output = 32 : a has been incremented

The operation seems to be interpreted as "a++b", the space been 
uninterpreted as a separator

Thanks for your insight,

Cheers,

Pascal.

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*Pascal MAUGIS*
Modélisation hydrologique et changement climatique, PhD

LSCE

Laboratoire des Sciences du Climat et de l'Environnement 
<http://www.lsce.ipsl.fr/>

Unité Mixte de Recherche CEA-CNRS-UVSQ (UMR 8212), IPSL, Paris-Saclay
Equipe MOSAIC : MOdelisation des SurfAces et Interfaces Continentales
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