/in/foo.cc: In function 'int main()':
/in/foo.cc:17:25: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int fm,fz,xs=0,zs=0,x,y;
                         ^
/in/foo.cc:17:23: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int fm,fz,xs=0,zs=0,x,y;
                       ^