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

float func(float x);

main()
{
   float x1,x2,x3,eps;
   int i=0;
   eps=1.0e-6;

   printf("Lower limit = ");
   scanf("%f",&x1);
   printf("Upper limit = ");
   scanf("%f",&x2);

   while(fabs(x1-x2)>eps){
      i++;
      x3=(x1+x2)/2.0;
      if((func(x1)*func(x3))<0.0){
         x2=x3;
      }else{
         x1=x3;
      }
   }

   printf("Iteration=%d  x=%15.5f\n",i,x3);
   return(0);
}

float func(float x)
{
   float y;
   y=x-3.0*exp(-x);
   return(y);
}