Example

       #include <math.h>

       main ()
       {
          double val = 16.0, fraction;
          int exp;

          fraction = frexp(val, &exp);
          printf("fraction = %f\n",fraction);
          printf("exp = %d\n",exp);

       }

     In this example, frexp converts the value 16 to .5 * 2 . The

     example produces the following output:

       fraction = 0.500000
       exp = 5

     |value| = Infinity or NaN is an invalid argument.