#include <iostream>
#include <iomanip>
#include <bitset>
using namespace std;
int main()
{
double n = 3.1415926;
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int n;
cin >> n;
cout.setf(ios::showbase);
cout << "十进制：" << n << endl;
cout.unsetf(ios::dec);
cout.setf(ios::oct);
cout << "八进制：" << n << endl;
cout.unsetf(ios::oct);
cout.setf(ios::hex);
cout << "十六进制：" << n << endl;
return 0;
}
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main()
{
double n = 3.1415926;
cout.setf(ios::internal);
cout.precision(8);
cout << n << endl;
cout.precision(6);
cout << n << endl;
cout.precision(4);
cout << n << endl;
return 0;
}
cout << setiosflags(ios::fixed) << setprecision(8) << n << endl;
cout << setiosflags(ios::fixed) << setprecision(6) << n << endl;
cout << setiosflags(ios::fixed) << setprecision(4) << n << endl;
cout << bitset<2>(n) << endl;
return 0;
}