foo.c: In function ‘main’:
foo.c:9:16: warning: zero-length gnu_printf format string [-Wformat-zero-length]
    9 |         printf("");
      |                ^~
foo.c:8:13: warning: ‘x’ is used uninitialized [-Wuninitialized]
    8 |         int max=x, cnt=1;
      |             ^~~
foo.c:7:13: note: ‘x’ declared here
    7 |         int x;
      |             ^