View Compilation Error

0_0_19674967_28845.cpp: In function 'int main()':
0_0_19674967_28845.cpp:18:15: error: 'scanf' was not declared in this scope
  scanf("%d",&n);
               ^
0_0_19674967_28845.cpp:23:31: error: 'printf' was not declared in this scope
   printf("%d\n",binaryPow(a,N));
                               ^