/in/foo.c: In function 'main':
/in/foo.c:11:17: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'double *' [-Wformat=]
   11 |         scanf("%f",&x);
      |                ~^  ~~
      |                 |  |
      |                 |  double *
      |                 float *
      |                %lf
/in/foo.c:23:9: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized]
   23 |         printf("%.3f",y);
      |         ^~~~~~~~~~~~~~~~
/in/foo.c:10:13: note: 'y' was declared here
   10 |     float x,y;
      |             ^