/in/foo.c: In function 'inputTab':
/in/foo.c:85:2: warning: implicit declaration of function 'scanf_s' [-Wimplicit-function-declaration]
  scanf_s("%d %d", &parents, &child);
  ^~~~~~~
/tmp/ccAxOMBo.o: In function `inputTab':
foo.c:(.text+0x121): undefined reference to `scanf_s'
/tmp/ccAxOMBo.o: In function `main':
foo.c:(.text.startup+0x17): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status