#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <math.h>
using namespace std;
int main(int argc, char *argv[]){
  //calculate the area of a triangle.
  //command line parameter is angle C(degree). 
  int i=1;
  double a,b;
  double ans,myans_l,myans_u;
  char message[128];
  a=2.;
  b=10.;
  ans=pow(a,b);
  strcpy(message,"Estimate 2 to the 10th ?(Calculate 2^{10})");
  cout <<message<<endl;
  cout <<"lower?> ";  
  cin>>myans_l;
  cout <<"upper?> ";
  cin>>myans_u;
  if(myans_l>myans_u){
    cout << "The lower limit is larger than the upper limit. Exiting" <<endl;
    return 1;
  }
  if(myans_u==ans||myans_l==ans){
    cout << "Bingo!" <<endl;
  }
  else if(myans_l<ans&&ans<myans_u){
    //never write myans_l<ans<myans_u !!
    cout << "Your estimation is right. The answer in in your range." <<endl;
  }
  else{
    //never write myans_l<ans<myans_u !!
    cout << "Your estimation is wrong. The answer in out of your range." <<endl;
  }

  return 0;
}