/in/foo.c: In function 'drinks':
/in/foo.c:3:9: warning: unused variable 'drinks' [-Wunused-variable]
     int drinks = n;
         ^~~~~~
/in/foo.c: In function 'main':
/in/foo.c:17:5: warning: implicit declaration of function 'scanf_s' [-Wimplicit-function-declaration]
     scanf_s("%d",&n);
     ^~~~~~~
/tmp/ccsTQo2P.o: In function `main':
foo.c:(.text.startup+0x13): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status