modf(3) 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 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 DESCRIPTION These functions break the argument x into an integral part and a frac- tional part, each of which has the same sign as x. The integral part is stored in the location pointed to by iptr. RETURN VALUE These 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). ERRORS No errors occur. ATTRIBUTES For an explanation of the terms used in this section, see at- tributes(7). ┌────────────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────────────────────────┼───────────────┼─────────┤ │modf(), modff(), modfl() │ Thread safety │ MT-Safe │ └────────────────────────────────────────────┴───────────────┴─────────┘ STANDARDS C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD. SEE ALSO frexp(3), ldexp(3) Linux man-pages 6.03 2023-02-05 modf(3)
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