View Compilation Error

0_0_34211799_27181.cpp: In function 'int main()':
0_0_34211799_27181.cpp:7:16: error: 'scanf' was not declared in this scope
  scanf("%d", &n);
                ^
0_0_34211799_27181.cpp:10:32: error: 'printf' was not declared in this scope
  if(b-c>a) printf("advertise\n");
                                ^
0_0_34211799_27181.cpp:11:39: error: 'printf' was not declared in this scope
  if(b-c==a) printf("does not matter\n");
                                       ^
0_0_34211799_27181.cpp:12:39: error: 'printf' was not declared in this scope
  if(b-c<a) printf("do not advertise\n");
                                       ^