#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout << "Default format: " << 123.123456789 << endl;
cout << "Default: " << 10.0 << endl;
cout << "After setting the showpos and showpoint flags: ";
cout << showpos << showpoint << 10.0 << "\n\n";
return 0;
}#include <iomanip>
#include <iostream>
using namespace std;
int main( ){
const double x = .39;
const double y = 27;
cout<< ".39, fixed, 1 decimal place: "
<< fixed << setprecision( 1 ) << x << endl
<< ".39, fixed, 2 decimal places: "
<< setprecision( 2 ) << x << endl
<< ".39, fixed, 3 decimal places: "
<< setprecision( 3 ) << x << endl << endl
<< ".39, scientific, 1 decimal place: "
<< scientific << setprecision( 1 ) << x << endl
<< ".39, scientific, 2 decimal places: "
<< setprecision( 2 ) << x << endl
<< ".39, scientific, 3 decimal places: "
<< setprecision( 3 ) << x << endl << endl
// return to default floating-point output format
<< resetiosflags( ios::fixed | ios::scientific )
<< setprecision( 6 )
<< ".39 and 27., default: " << x << " " << y << endl
<< ".39 and 27., default, 1 decimal place: "
<< setprecision( 1 ) << x << " " << y << endl
<< ".39 and 27., default, 2 decimal places: "
<< setprecision( 2 ) << x << " " << y << endl
<< ".39 and 27., default, 3 decimal places: "
<< setprecision( 3 ) << x << " " << y << endl << endl
<< ".39 and 27., default, decimal point: "
<< showpoint << x << " " << y << endl
<< ".39 and 27., default, decimal point, 1 decimal place: "
<< setprecision( 1 ) << x << " " << y << endl
<< ".39 and 27., default, decimal point, 2 decimal places: "
<< setprecision( 2 ) << x << " " << y << endl
<< ".39 and 27., default, decimal point, 3 decimal places: "
<< setprecision( 3 ) << x << " " << y << endl;
}#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout << "Default format: " << 123.123456789 << endl;
cout << "Scientific format with precision of 7: ";
cout << scientific << 123.123456789 << endl;
cout << "Return to default format: ";
cout << resetiosflags(ios::floatfield) << setprecision(6)
<< 123.123456789 << "\n\n";
return 0;
}#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout << "Default format: " << 123.123456789 << endl;
cout << "setw manipulator is useful when repeated field\n"
<< "widths must be specified. For example:\n";
cout << setw(8) << "this" << endl << setw(8) << "is" << endl
<< setw(8) << "a" << endl << setw(8) << "column" << endl
<< setw(8) << "of" << endl << setw(8) << "words";
return 0;
}#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout << "Default format: " << 123.123456789 << endl;
cout << "Use a field width of 20:\n";
cout << "|" << setw(20) << "Testing" << "|\n\n";
cout << "Use a field width of 20 with left justification:\n";
cout << "|" << setw(20) << left << "Testing" << "|\n\n";
return 0;
}