foo.c: In function 'main':
foo.c:6:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
6 | scanf_s("%d %c %d", &a, &b, &c);
| ^~~~~~~
| scanf
foo.c:12:9: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
12 | printf("%d%c%d=%d", a, b, c, d);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/nix/store/dpxy5cr7cm0nch0qvq2qygs9jwnmhiy5-binutils-2.38/bin/ld: /tmp/ccO5o3dv.o: in function `main':
foo.c:(.text.startup+0x1c): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status
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