#include<iostream>
#include <iomanip>

using namespace std;

main()
{
     float x = 189; 
     cout<<x << endl;               //displays 18
     cout.setf(ios::showpoint); 
     cout<< x << endl;              //displays 18.0000
     cout.setf(ios::scientific);
     cout<< x << endl;               //displays 1.800000e+001
     cout.unsetf(ios::showpoint);
     cout.unsetf(ios::scientific);
     cout<<x<<endl;                  //displays 18
     system("pause");
}