View Compilation Error

0_0_34943144_26112.cpp: In function 'int main()':
0_0_34943144_26112.cpp:8:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^
0_0_34943144_26112.cpp:13:13: error: 'cout' was not declared in this scope
             cout<<"6";
             ^
0_0_34943144_26112.cpp:18:19: error: 'endl' was not declared in this scope
             cout<<endl;
                   ^