MB> property, if you want to loop through the circle, using
 MB> foo=(foo+1)%360, you will do it faster using foo=(foo+1)&255, in which
 MB> &255 is an optimization of %256.
If you let the compiler do the following optimization:
 MB> y*256+y*64 and then optimized to (y<<8)+(y<<6). TC++ only does the
Then also let it do the optimization from %256 to &255.  Most current 
compilers do it, and it's readable.  :-)
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