MODF(3) BSD Programmer's Manual MODF(3)
modf - extract signed integral and fractional values from floating-point
modf(double value, double *iptr);
The modf() function breaks the argument value into integral and fraction-
al 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.
The modf() function returns the signed fractional part of value.
frexp(3), ldexp(3), math(3)
The modf() function conforms to ANSI C X3.159-1989 (``ANSI C '').
4.4BSD June 4, 1993 1