Three little macro's. The first and third are ok, the second is not. The only
difference between Twee and Drie is the position of the semi-colons. I
understand that a macro works by text replacement. That does not make me
understand why Twee doesn't work and Drie does. Can somebody explain?

#macro Een(A,B,C)
   A+B+C
#end //macro
#declare Som1=Een(1,2,3);
sphere {Som1,1}


#macro Twee(A,B,C)
   #local P=A+B+C;
   #if (P=0)
      A+B-C
   #else
      A+B+C
   #end
#end
#declare Som2=Twee(1,2,3);
sphere {Som2,1}


#macro Drie(A,B,C)
   #local P=A+B+C;
   #if (P=0)
      A+B-C;
   #else
      A+B+C;
   #end
#end
#declare Som3=Drie(1,2,3)
sphere {Som3,1}


ingo
--
Met dank aan de muze met het glazen oog.

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