View Compilation Error

0_0_24853397_22235.cpp: In function 'int main()':
0_0_24853397_22235.cpp:20:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)&&n)
                     ^
0_0_24853397_22235.cpp:25:36: error: 'printf' was not declared in this scope
    printf("%d is a Sky Number.\n",n);
                                    ^
0_0_24853397_22235.cpp:28:39: error: 'printf' was not declared in this scope
   printf("%d is not a Sky Number.\n",n);
                                       ^