/in/foo.cc: In function 'int main()':
/in/foo.cc:5:2: error: expected ';' before 'cin'
  cin >>A >>B;
  ^~~
/in/foo.cc:5:13: warning: statement has no effect [-Wunused-value]
  cin >>A >>B;
             ^
/in/foo.cc:6:9: error: 'A' was not declared in this scope
  cout <<A+B;
         ^
/in/foo.cc:6:11: error: 'B' was not declared in this scope
  cout <<A+B;
           ^