#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;
}