/in/foo.cc: In function 'int main()':
/in/foo.cc:47:41: warning: 'sum2' may be used uninitialized in this function [-Wmaybe-uninitialized]
         else printf("%d %d\n",sum2,sum1);
                                         ^
/in/foo.cc:47:41: warning: 'sum1' may be used uninitialized in this function [-Wmaybe-uninitialized]