View Compilation Error

0_0_27615999_4518.cpp: In function 'int main()':
0_0_27615999_4518.cpp:6:38: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d%d%d",  &a, &b, &n) != EOF)
                                      ^
0_0_27615999_4518.cpp: At global scope:
0_0_27615999_4518.cpp:19:6: error: expected constructor, destructor, or type conversion before ';' token
  
      ^