foo.c: In function 'main':
foo.c:4:9: warning: implicit declaration of function 'scanf_s' [-Wimplicit-function-declaration]
    4 |         scanf_s("%d", &n);
      |         ^~~~~~~
foo.c:6:28: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
    6 |         if ((n >= 1) && (n <= 10 ^ 16))
      |                          ~~^~~~~
foo.c:15:9: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   15 |         printf("%d", c);
      |         ^~~~~~
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | int main()
foo.c:15:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   15 |         printf("%d", c);
      |         ^~~~~~
foo.c:15:9: note: include '<stdio.h>' or provide a declaration of 'printf'
/nix/store/jfkmqz20q8fsaqizcml86adxqyzlwllx-binutils-2.38/bin/ld: /tmp/ccciGyGK.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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