foo.c: In function 'main':
foo.c:6:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    6 |         gets(s);
      |         ^~~~
In file included from foo.c:1:
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.c:21:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   21 |         if(i=strlen(s))
      |            ^
foo.c:8:13: warning: unused variable 'flag' [-Wunused-variable]
    8 |         int flag;
      |             ^~~~
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: /tmp/ccR9QN5F.o: in function `main':
foo.c:(.text.startup+0x8): warning: the `gets' function is dangerous and should not be used.

[Hydro](https://hydro.ac)提供评测服务