foo.c: In function 'main':
foo.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    9 |     gets(s1);gets(s2);
      |     ^~~~
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:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    9 |     gets(s1);gets(s2);
      |     ^~~~
/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:10:15: warning: unused variable 'len1' [-Wunused-variable]
   10 |     int cnt=0,len1=strlen(s1),len2=strlen(s2);
      |               ^~~~
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: /tmp/ccW3EZpF.o: in function `main':
foo.c:(.text.startup+0x48): warning: the `gets' function is dangerous and should not be used.

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