View Compilation Error

0_0_20915411_23147.cpp: In function 'int main()':
0_0_20915411_23147.cpp:52:12: error: 'cout' was not declared in this scope
            cout << "Case "<<c<<":"<<endl;
            ^
0_0_20915411_23147.cpp:52:29: error: 'c' was not declared in this scope
            cout << "Case "<<c<<":"<<endl;
                             ^
0_0_20915411_23147.cpp:52:37: error: 'endl' was not declared in this scope
            cout << "Case "<<c<<":"<<endl;
                                     ^