/in/foo.c: In function 'main':
/in/foo.c:15:27: warning: format '%lf' expects argument of type 'double', but argument 3 has type 'int' [-Wformat=]
  else printf("%.2lf\n,%.2lf\n",x1,0, x2,0);
                           ^
/in/foo.c:15:14: warning: too many arguments for format [-Wformat-extra-args]
  else printf("%.2lf\n,%.2lf\n",x1,0, x2,0);
              ^~~~~~~~~~~~~~~~~
/in/foo.c:15:7: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  else printf("%.2lf\n,%.2lf\n",x1,0, x2,0);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:15:7: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized]