%!PS
% Illustrates for-loop
% Joseph O'Rourke

% Line parameters
5 setlinewidth
0 0 1 setrgbcolor % Blue
1 setlinecap % Round caps

% To convert inches to points
/inch {72 mul} def 

% Set origin to be center of 8.5x11 page
4.25 inch 5.5 inch translate

% Draw circles on diagonal
% start incr end
0 10 100 {
   newpath
   dup % i is on stack, copy it so i,i is on stack
   % x,y = i,i are the 1st two of the 5 params to arc
   50 0 360 arc
   stroke
} for

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