View Compilation Error

0_0_34757935_385.cpp: In function 'int main()':
0_0_34757935_385.cpp:5:5: error: 'cin' was not declared in this scope
     cin >> a >> b;
     ^
0_0_34757935_385.cpp:6:5: error: 'cout' was not declared in this scope
     cout << a+b << "\n";
     ^