foo.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
foo.cpp: In function 'int main()':
foo.cpp:6:1: error: 'cin' was not declared in this scope
 cin >> a >> b;
 ^
foo.cpp:7:1: error: 'cout' was not declared in this scope
 cout << a + b << endl;
 ^
foo.cpp:7:18: error: 'endl' was not declared in this scope
 cout << a + b << endl;
                  ^