#include <math.h>
#include <stdio.h>
#include <fenv.h>

int
main(int argc, char **argv)
{ double r = 0.89162566041669111;
  double exp = 0.89162645116448402;
  double x;

  fesetround(FE_UPWARD);
  x = pow(r, exp);
  printf("X=%15f\n", x);
  return 0;
}