foo.c: In function 'main':
foo.c:5:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
5 | gets(s);
| ^~~~
In file included from foo.c:1:
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
| ^~~~
foo.c:7:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
7 | scanf_s("%d", &k);
| ^~~~~~~
| scanf
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/ccR1h2ya.o: in function `main':
foo.c:(.text.startup+0xd): warning: the `gets' function is dangerous and should not be used.
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: foo.c:(.text.startup+0x1e): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status
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