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#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
double fNum = 1234567890;
cout.setf(ios_base::fixed);
cout << fNum << endl;
cout.setf(ios_base::scientific);
cout << fNum << endl;
return 0;
}
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
double fNum = 1234567890;
cout << fixed << fNum << endl;
return 0;
}