View Compilation Error

0_0_31677791_28951.cpp: In function 'int main()':
0_0_31677791_28951.cpp:5:49: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%c%c%c%*c", &a, 1, &b, 1, &c, 1) != EOF)
                                                 ^