#include <stdio.h>
#include <stdlib.h>

int main ()
{
   double l, u, x, e;
   int i;

   /* Part I */
   l = -100; u = 100;
   e = 1e-10;
   while ((u - l) > e) {
      x = (l + u)/2;
      if (x*x*x+123*x*x+5678*x+97531 < 0) l = x;
      else u = x;
   }
   printf("x = %12.10lf = ", x);

   /* Part II */
   if (x < 0) { printf("-"); x = -x; }
   printf("0x");
   printf("%x.", (int)x);
   x -= (int)x;
   for (i=1; i<=8; ++i) {
      x *= 16;
      printf("%x",(int)x);
      x -= (int)x;
   }
   printf("\n");

   exit(0);
}