View Compilation Error

0_0_38075453_7016.cpp: In function 'int main()':
0_0_38075453_7016.cpp:38:25: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d", &n) != EOF)
                         ^
0_0_38075453_7016.cpp:38:30: error: 'EOF' was not declared in this scope
  while (scanf_s("%d", &n) != EOF)
                              ^
0_0_38075453_7016.cpp:40:22: error: 'printf' was not declared in this scope
   printf("%d\n", f(n));
                      ^