foo.c: In function 'main':
foo.c:5:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    5 |         scanf_s("%d", &x);
      |         ^~~~~~~
      |         scanf
foo.c:10:17: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   10 |                 for (int x1=2; x1 <= n; x1++);
      |                 ^~~
foo.c:11:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   11 |                 {if (x % x1 == 0)
      |                 ^
/nix/store/j2gmfdd29cp3rcvghmn1a5kgcnmf8myp-binutils-2.40/bin/ld: /tmp/cc68hFQm.o: in function `main':
foo.c:(.text.startup+0x11): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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