View Compilation Error

0_0_34484673_1446.cpp: In function 'int main()':
0_0_34484673_1446.cpp:36:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_34484673_1446.cpp:50:41: error: 'printf' was not declared in this scope
   printf("%lld\n",((a*n)%mod+phin+n)%mod);
                                         ^