> When you read ten variables from file but there
> is nine in file then after ninth reading file handle is udefined

Note that in your code, you are testing whether the variable "aah" is
defined, rather than the file handle. However, the following code gives the
same error message:

#fopen wfile "nothing.txt" write
#fopen rfile "nothing.txt" read
#ifdef(rfile)
  #read(rfile,ahh)
  #local ohh=ahh;
#end

Anders

--
light_source{6#macro A(B)#declare C=mod(E B);#declare E=(E-C)/B;C#end
#macro B(E)#while(E)#if(A(8)=7)#declare D=D+2.8;#else#if(C<3)cylinder
{0(C=<1 2>).2translate<D+C*A(2)A(4)#else intersection{torus{1 .2}box{
-y 2}rotate<-1 0C+1>*90translate<D+1A(2)*2+1#end-2 13>finish{specular
1}pigment{red 1}}#end#end#end#local D=-8;1}B(445000298)B(519053970)B(
483402386)B(1445571258)B(77778740)B(541684549)B(42677491)B(70)

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