Printing floating point numbers code snippet

#include <iostream>

#include <iomanip>

using namespace std;

int main() {

      double pi = 3.141592653;

      // print 3.14

      cout.precision(2);

      cout << "Two digits after point: " << fixed << pi << endl;

      // print pi using scientific notation

      cout << "Scientific notation: " << scientific << pi << endl;

      // set default notation

      cout.unsetf(ios_base::scientific);

      // set enough precision to show all digits

      // (requires <iomanip>)

      cout << "PI: " << setprecision(10) << pi << endl;

      return 0;

}