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

MODF(3) 						   BSD Library Functions Manual 						   MODF(3)

NAME
modf, modff, modfl -- extract signed integral and fractional values from floating-point number
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double modf(double value, double *iptr); float modff(float value, float *iptr); long double modfl(long double value, long double *iptr);
DESCRIPTION
The modf(), modff(), and modfl() functions break the argument value into integral and fractional parts, each of which has the same sign as the argument. It stores the integral part as a floating point number in the object pointed to by iptr.
RETURN VALUES
These functions return the signed fractional part of value.
SEE ALSO
frexp(3), ldexp(3), math(3)
STANDARDS
The modf(), modff(), and modfl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD
March 29, 2008 BSD

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