View Compilation Error

0_0_32827368_2730.cpp: In function 'int main()':
0_0_32827368_2730.cpp:3:1: error: 'cin' was not declared in this scope
 cin >> a >> b;
 ^
0_0_32827368_2730.cpp:4:1: error: 'cout' was not declared in this scope
 cout << a + b;
 ^