modf()                  Split Floating Point into Integer Part and Fraction

 #include   <math.h>

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

    modf() separates 'x' into fractional and integer parts.  'intptr' is
    set to the integer portion, and the fractional portion is returned.

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

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

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

           #include <math.h>      /* For function decl. 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 */
           }