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Man Pages
FMOD(3) FreeBSD Library Functions Manual FMOD(3)

fmod, fmodf, fmodl
floating-point remainder functions

Math Library (libm, -lm)

#include <math.h>

double
fmod(double x, double y);

float
fmodf(float x, float y);

long double
fmodl(long double x, long double y);

The fmod(), fmodf(), and fmodl() functions compute the floating-point remainder of x/ y.

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.

math(3)

The fmod(), fmodf(), and fmodl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
June 19, 2008 FreeBSD 13.1-RELEASE

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