foo.c:15:6: warning: return type of 'main' is not 'int' [-Wmain]
 void main()
      ^~~~
foo.c: In function 'main':
foo.c:20:2: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
  scanf_s("%d %d %d", &m, &n, &k);
  ^~~~~~~
  scanf
/tmp/ccLHf3vn.o: In function `main':
foo.c:(.text.startup+0x3b): undefined reference to `scanf_s'
foo.c:(.text.startup+0x85): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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