modf - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEmodf, modff, modfl − extract signed integral and fractional values from floating-point number

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double modf(double x, double *iptr); float modff(float x, float *iptr); long double modfl(long double x, long double *iptr);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): modff(), modfl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions break the argument x into an integral part and a fractional part, each of which has the same sign as x. The integral part is stored in the location pointed to by iptr.

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RETURN VALUEThese functions return the fractional part of x. If x is a NaN, a NaN is returned, and *iptr is set to a NaN. If x is positive infinity (negative infinity), +0 (−0) is returned, and *iptr is set to positive infinity (negative infinity).

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ERRORSNo errors occur.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue modf(), modff(), modfl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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SEE ALSOfrexp(3), ldexp(3) 0

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