/in/foo.c: In function 'main':
/in/foo.c:21:9: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized]
   21 |         printf("%.3f",y);
      |         ^~~~~~~~~~~~~~~~
/in/foo.c:6:11: note: 'y' was declared here
    6 |   float x,y;
      |           ^