foo.c: In function ‘main’:
foo.c:13:9: warning: ‘n’ may be used uninitialized [-Wmaybe-uninitialized]
   13 |         printf("%d",n);
      |         ^~~~~~~~~~~~~~
foo.c:7:18: note: ‘n’ was declared here
    7 |         int i=1, n;
      |                  ^