/in/foo.c: In function 'main':
/in/foo.c:6:14: warning: 'n' is used uninitialized [-Wuninitialized]
    6 | for(int i=1;i<=n;i++){
      |             ~^~~
/in/foo.c:4:9: note: 'n' was declared here
    4 |     int n;
      |         ^