/in/foo.c: In function 'main':
/in/foo.c:7:5: warning: implicit declaration of function 'scanf_s' [-Wimplicit-function-declaration]
     scanf_s("%d%d%d",&a, &b, &c);
     ^~~~~~~
/in/foo.c:27:2: error: expected declaration or statement at end of input
  return 0;
  ^~~~~~