Main.c: In function 'main':
Main.c:11:5: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
   11 |     scanf_s("%c %lf %lf %c %c",&ch,&a,&b,&c1,&c2);
      |     ^~~~~~~
      |     scanf
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccjjmNcI.o: in function `main':
Main.c:(.text.startup+0x35): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status