View Compilation Error

0_0_24708118_2298.cpp: In function 'int main()':
0_0_24708118_2298.cpp:6:18: error: 'scanf_s' was not declared in this scope
  scanf_s("%d", &N);
                  ^
0_0_24708118_2298.cpp:7:13: error: 'ffush' was not declared in this scope
  ffush(stdin);
             ^