#include <iostream>
#include <cstdlib>
#include <iomanip>
using namespace std;

int main()
{
	double d = 6.66666666666666; //15 digits, including 1 to left of decimal
	ios_base::fmtflags save = cout.flags();
	streamsize prec = cout.precision();
	cout << "The default precision is " << prec << ".\n";

	cout << d << "\n"                       //printf("%g", d);
		<< setprecision(3) << d << "\n"     //printf("%.3g", d);
		<< fixed << d << "\n"               //printf("%.3f", d);
		<< scientific << d << "\n"          //printf("%.3e", d);
		<< resetiosflags(ios_base::floatfield)<<d<<"\n" //printf("%.3g",d);
		<< setprecision(prec) << d << "\n"; //printf("%g", d);

	cout.setf(save, ios_base::floatfield);
	cout << d << "\n";                      //same format as line 13
	return EXIT_SUCCESS;
}