#include <iostream>
using namespace std;
 
int main() {
  double x = 0.3;
  x-=0.1;
  x-=0.1;
  x-=0.1;
  if (x==0)  // Wrong! 
    cout << "variable x is equal to zero" << endl;
  else 
    cout << " x = " << x << endl; 	
  return 0;
}