View Compilation Error

0_0_29435139_5996.cpp: In function 'int main()':
0_0_29435139_5996.cpp:22:11: error: 'cin' was not declared in this scope
     while(cin>>q>>n&&n)
           ^
0_0_29435139_5996.cpp:59:9: error: 'cout' was not declared in this scope
         cout<<setiosflags(ios::fixed)<<setprecision(2)<<zong<<endl;
         ^
0_0_29435139_5996.cpp:59:27: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
         cout<<setiosflags(ios::fixed)<<setprecision(2)<<zong<<endl;
                           ^
0_0_29435139_5996.cpp:59:63: error: 'endl' was not declared in this scope
         cout<<setiosflags(ios::fixed)<<setprecision(2)<<zong<<endl;
                                                               ^