View Compilation Error

0_0_26155397_11607.cpp: In function 'int main()':
0_0_26155397_11607.cpp:18:5: error: 'cin' was not declared in this scope
     cin>>c;
     ^
0_0_26155397_11607.cpp:26:13: error: 'cout' was not declared in this scope
             cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;
             ^
0_0_26155397_11607.cpp:26:65: error: 'endl' was not declared in this scope
             cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;
                                                                 ^