View Compilation Error

0_0_32335438_14541.cpp: In function 'int main()':
0_0_32335438_14541.cpp:8:22: error: 'scanf_s' was not declared in this scope
   scanf_s("%c", &a[i]);
                      ^
0_0_32335438_14541.cpp:47:48: error: 'printf' was not declared in this scope
   printf("%c %c %c\n", a[i], a[i + 1], a[i + 2]);
                                                ^