/in/foo.c: In function 'main':
/in/foo.c:6:17: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
    6 |         scanf("%d,&n");
      |                ~^
      |                 |
      |                 int *
/in/foo.c:7:22: warning: 'n' is used uninitialized [-Wuninitialized]
    7 |         for(int i=2;i<=n;i++){
      |                     ~^~~
/in/foo.c:5:13: note: 'n' was declared here
    5 |         int n;
      |             ^