/in/foo.c: In function 'main':
/in/foo.c:4:18: warning: format '%lf' expects a matching 'double *' argument [-Wformat=]
    4 |         scanf("%lf,&f");
      |                ~~^
      |                  |
      |                  double *
/in/foo.c:5:32: warning: 'f' is used uninitialized [-Wuninitialized]
    5 |         double celsius=5.0/9*(f-32);
      |                              ~~^~~~
/in/foo.c:3:16: note: 'f' was declared here
    3 |         double f;
      |                ^