View Compilation Error

0_0_29281827_17185.cpp: In function 'int main()':
0_0_29281827_17185.cpp:17:5: error: 'cin' was not declared in this scope
     cin>>c;
     ^
0_0_29281827_17185.cpp:25:13: error: 'cout' was not declared in this scope
             cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;
             ^
0_0_29281827_17185.cpp:25:65: error: 'endl' was not declared in this scope
             cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;
                                                                 ^