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

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

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

double df(double x)
{
  return(1 + exp(-x) + cos(x));
}

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

  x1 = -10;

  for(i = 0; i < MAXNUM; ++i){
    printf("x1 = %lf   f(x) = %le\n", x1, f(x1));
    x2 = x1 - f(x1) / df(x1);
    if(fabs(x1 - x2) < EPS){
      printf("Ans. = %lf (Iteration No. = %d)\n", x2, i);
      break;
    }
    else
      x1 = x2;
  }
}