modf(3)                                                         modf(3)

  modf()

  NAME

    modf() - extract signed integral and fractional values from floating-point
    number

  SYNOPSIS

    #include 

    double modf (double value, double *iptr)

  DESCRIPTION

    The modf(3) function breaks 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 double in the object pointed to by iptr.

  RETURN VALUES

    The modf(3) function returns the signed fractional part of value.

  SEE ALSO

    frexp(3)

    ldexp(3)

  USAGE NOTES

    The modf function is thread safe.

    The modf function is not async-signal safe.