View Compilation Error

0_0_31892333_13573.cpp: In function 'int main()':
0_0_31892333_13573.cpp:8:5: error: 'cout' was not declared in this scope
     cout << sum << endl;
     ^
0_0_31892333_13573.cpp:8:20: error: 'endl' was not declared in this scope
     cout << sum << endl;
                    ^