View Compilation Error

0_0_17346925_31593.cpp: In function 'int main()':
0_0_17346925_31593.cpp:12:25: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d", &n) != EOF)
                         ^
0_0_17346925_31593.cpp:15:29: error: 'memset' was not declared in this scope
   memset(sum, 0, sizeof(sum));
                             ^