1 #include <iostream> 2 3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */ 4 using namespace std; 5 int main(int argc, char** argv) { 6 int a=21; 7 cout.setf(ios::showbase); 8 cout<<"dec:"<<a<<endl; 9 cout.unsetf(ios::dec); 10 cout.setf(ios::hex); 11 cout<<"hex:"<<a<<endl; 12 cout.unsetf(ios::hex); 13 cout.setf(ios::oct); 14 cout<<"oct:"<<a<<endl; 15 cout.unsetf(ios::oct); 16 char *pt="China"; 17 cout.width(10); 18 cout<<pt<<endl; 19 cout.width(10); 20 cout.fill('*'); 21 cout<<pt<<endl; 22 double pi=22.0/7.0; 23 cout.setf(ios::scientific); 24 cout<<"pi="; 25 cout.width(14); 26 cout.width(14); 27 cout<<pi<<endl; 28 cout.unsetf(ios::scientific); 29 cout.setf(ios::fixed); 30 cout.width(12); 31 cout.setf(ios::showpos); 32 cout.setf(ios::internal); 33 cout.precision(6); 34 cout<<pi<<endl; 35 return 0; 36 }