HELPLIB.HLB  —  CC  /PRECISION
     /PRECISION={SINGLE | DOUBLE}

  Controls whether floating-point operations on float variables are
  performed in single or double precision.

  The default is /PRECISION=DOUBLE for /STANDARD=VAXC and
  /STANDARD=COMMON modes.

  The default is /PRECISION=SINGLE for /STANDARD=ANSI89 and
  /STANDARD=RELAXED modes.
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