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     The fmod function calculates the floating-point remainder <f> of
     <x>/<y> such that <x> = <i>*<y> + <f>, where <i> is an integer,
     <f> has the same sign as <x>, and the absolute value of <f> is
     less than the absolute value of <y>.
 
     The fmodl function uses the 80-bit long double form of arguments
     and return values. In all other respects, it is identical to the
     regular function.
 
     Return Value
 
     These functions return the floating-point remainder. If <y> is 0,
     the function returns 0.
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