/in/foo.cc: In function 'int main()':
/in/foo.cc:8:17: warning: 'a' is used uninitialized in this function [-Wuninitialized]
     cout << a + b << endl;
                 ^
/in/foo.cc:8:17: warning: 'b' is used uninitialized in this function [-Wuninitialized]