View Compilation Error

0_0_24117140_5252.cpp: In function 'int main()':
0_0_24117140_5252.cpp:5:14: error: 'cin' was not declared in this scope
       while (cin >> a >> b) {
              ^
0_0_24117140_5252.cpp:7:11: error: 'cout' was not declared in this scope
           cout << a + b << endl;
           ^
0_0_24117140_5252.cpp:7:28: error: 'endl' was not declared in this scope
           cout << a + b << endl;
                            ^