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FreeBSD 11.0 - man page for fmod (freebsd section 3)

FMOD(3) 						   BSD Library Functions Manual 						   FMOD(3)

NAME
fmod, fmodf, fmodl -- floating-point remainder functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double fmod(double x, double y); float fmodf(float x, float y); long double fmodl(long double x, long double y);
DESCRIPTION
The fmod(), fmodf(), and fmodl() functions compute the floating-point remainder of x/ y.
RETURN VALUES
If y is non-zero, the fmod(), fmodf(), and fmodl() functions return the value x-i*y, for some integer i, such that the result has the same sign as x and magnitude less than the magnitude of y. If y is zero, a NaN is produced.
SEE ALSO
math(3)
STANDARDS
The fmod(), fmodf(), and fmodl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD
June 19, 2008 BSD