/in/foo.c: In function 'main':
/in/foo.c:15:7: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  else printf("%.2lf\n,%.2lf\n",x1,x2);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:15:7: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized]