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    Command:

    modff

    
    
    
    

    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);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           modf(), modfl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The  modf()  function breaks 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.
    
    
    

    RETURN VALUE

           The modf() function returns 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

       Multithreading (see pthreads(7))
           The modf(), modff(), and modfl() functions are thread-safe.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
    

    SEE ALSO

           frexp(3), ldexp(3)
    
                                      2013-06-21                           MODF(3)
    
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