#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int a;
    cout<<"input a:";
    cin>>a;
    cout<<"dec:"<<dec<<a<<endl;
    cout<<"hex:"<<hex<<a<<endl;
    cout<<"oct:"<<setbase(8)<<a<<endl;
    char *pt="China";
    cout<<setw(10)<<pt<<endl;
    cout<<setfill('*')<<setw(10)<<pt<<endl;
    double pi=22.0/7.0;
    cout<<setiosflags(ios::scientific)<<setprecision(8);
    cout<<"pi="<<pi<<endl;
    cout<<"pi="<<setprecision(4)<<pi<<endl;
    cout<<"pi="<<setiosflags(ios::fixed)<<pi<<endl;
    return 0;
}