libm.info: remainder

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`remainder', `remainderf'--round and remainder

*Synopsis*
     #include <math.h>
     double remainder(double X, double Y);
     float remainderf(float X, float Y);
   *Description*
`remainder' and `remainderf' find the remainder of X/Y; this value is
in the range -Y/2 .. +Y/2.
*Returns*
`remainder' returns the integer result as a double.
*Portability*
`remainder' is a System V release 4.  `remainderf' is an extension.