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

#define MAXNUM 1000
#define EPS 1.e-6

double f(double x)
{
  return(x - exp(-x) + sin(x));
}

main()
{
  double x1, x2, mid_x;
  int i;

  x1 = -100.0;
  x2 =  100.0;
  for(i = 0; i < MAXNUM; ++i){
    if(f(x1) * f(x2) < 0){
      printf("There should be an answer! (x1 = %lf  x2 = %lf)\n", x1, x2);
      mid_x = (x2 + x1)/ 2;
      if(f(mid_x)*f(x1) < 0) x2 = mid_x;
      else x1 = mid_x;
    }
    else{
      printf("Hmm, initial values do not seem to be good\n");
      x1 = x1 * 2;
      x2 = x2 * 2;
    }
    if(fabs(x1 - x2) < EPS){
      printf("Ans. = %lf (Iteration No. = %d)\n", (x1+x2)/2, i);
      break;
    }
  }
}