View Compilation Error

0_0_21600630_17509.cpp: In function 'int main()':
0_0_21600630_17509.cpp:4:29: error: 'scanf' was not declared in this scope
  while (scanf("%d%d", &a, &b) == 2) {
                             ^
0_0_21600630_17509.cpp:5:37: error: 'printf' was not declared in this scope
   printf("%d\n", (a - b) & b ? 0 : 1);
                                     ^