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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _arc routines draw elliptical arcs.
 
     The _arc routine uses the viewport coordinate system. The _arc_w
     and _arc_wxy functions use the window coordinate system. The
     center of the arc is the center of the bounding rectangle defined
     by the points (<x1>, <y1>) and (<x2>, <y2>)──(<pwxy1>, <pwxy2>)
     and (<pwxy3>, <pwxy4>) for _arc_wxy.
 
     The arc starts where it intersects the imaginary line extending
     from the center of the arc through (<x3>, <y3>)──pwxy3 for
     _arc_wxy. It is drawn counterclockwise about the center of the
     arc, ending where it intersects an imaginary line extending from
     the center of the arc through (<x4>, <y4>)──pwxy4 for _arc_wxy.
 
     In both cases, the arc is drawn using the current color. Since an
     arc does not define a closed area, it is not filled.
 
     Return Value
 
     The _arc, _arc_w, and _arc_wxy functions return a nonzero value
     if the arc is successfully drawn; otherwise, they return 0.
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