View Compilation Error

0_0_30164089_14325.cpp: In function 'int main()':
0_0_30164089_14325.cpp:7:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_30164089_14325.cpp:11:3: error: 'cout' was not declared in this scope
   cout<<setiosflags(ios::uppercase)<<hex<<x;
   ^
0_0_30164089_14325.cpp:11:21: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
   cout<<setiosflags(ios::uppercase)<<hex<<x;
                     ^
0_0_30164089_14325.cpp:12:9: error: 'endl' was not declared in this scope
   cout<<endl;
         ^