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 modf()                  Split Floating Point into Mantissa and Exponent

 #include   <math.h>

 double     modf(x,intptr);
 double     x;                           Floating-point value
 double     *intptr;                     Pointer to stored integer portion

    modf() separates 'x', a floating-point value, into an integer
    portion, which is stored in 'intptr' and a fractional portion, which
    is returned by the function.

    Returns:    The fractional part of 'x'; no error return.

   -------------------------------- Example ---------------------------------

    The following statements get the fractional and integer parts of two
    different floating-point values:

           #include <math.h>      /* Required for function declaration only*/

           main()
           {
               double f, i;

               f = modf(69.2665, &i);    /* f = 0.2665, i = 69.0 */
               f = modf(-69.2665, &i);   /* f = -0.2665, i = -69.0 */
           }