View Compilation Error

0_0_21704293_15718.cpp: In function 'int main()':
0_0_21704293_15718.cpp:17:9: error: 'cin' was not declared in this scope
         cin>>c;  
         ^
0_0_21704293_15718.cpp:25:17: error: 'cout' was not declared in this scope
                 cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;  
                 ^
0_0_21704293_15718.cpp:25:69: error: 'endl' was not declared in this scope
                 cout<<std::setprecision(2)<<std::fixed<<p*100<<"%"<<endl;  
                                                                     ^