/in/foo.cc: In function 'int main()':
/in/foo.cc:9:7: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(x*x+y*y==ai)
      ~^~
/in/foo.cc:9:11: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(x*x+y*y==ai)
          ~^~