/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: error: 'a' was not declared in this scope
  printf("%d\n",a+b);
                ^
/in/foo.cc:8:18: error: 'b' was not declared in this scope
  printf("%d\n",a+b);
                  ^
/in/foo.cc:12:1: error: expected ';' before '}' token
 }
 ^