Program for calculating E

A program for calculating E in C++, in a stupid way no doubt.

#include <iostream>
#include <iomanip>

using namespace std;

int main() {

  double sum=0;
  for(double x=1;x<10;x=x+0.000000001) {
    double y = 1/x;
    sum += 0.000000001*y;

    if(sum >= 1) {
      cout << "E: " << setprecision(15) << x << endl;
      return 0;
    }
  }
}

Another method:

#include <iostream>
#include <iomanip>

using namespace std;

int main() {

  double e=1;
  for(double n=0;n<=1;n=n+0.000000001) {
    e=e+(e*0.000000001);
  }
  cout << "E: " << setprecision(15) << e << endl;

}