How should I rewrite the following to avoid UU & VV to become bigger 
than Umax and Vmax?

#declare Uiter=100;
#declare Viter=100;
#declare Umin=0.0000001;
#declare Umax=0.9999999;
#declare Vmin=0.0000001;
#declare Vmax=1.9999999;
#declare iU=(Umax-Umin)/Uiter;
#declare iV=(Vmax-Vmin)/Viter;

#declare VV=Vmin;
#while (VV<Vmax)
   #declare UU=Umin;
   #while (UU<Umax)
        
      #declare UU=UU+iU;         
      #declare VV=VV+iV;
      #if (UU>=1 | VV>=2)
         #debug concat("UU+ =",str(UU,0,-1),"\n")
         #debug concat("VV+ =",str(VV,0,-1),"\n")
      #end
      
      #declare UU=UU-iU;
      #declare VV=VV-iV;

      #declare UU=UU+iU;      
   #end 
   #declare VV=VV+iV;
#end


Ingo

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