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   modf

   Usage
   #include <math.h>
   double modf(double x,double *ptr);

   Description
   modf  returns  the signed fractional value of x. The  signed  integral
   part of x is stored at the location pointed to by ptr.

   Example
   #include <math.h>
   #include <stdio.h>
   main()
   {
   double x,y,n;
        x = -41.56789;
        y = modf(x,&n);
        printf("modf(%f) = fractional: %f and integer: %f",x,y,n);
   }

   Return Value
   The function modf returns the signed fractional portion of x.