View Compilation Error

0_0_34484611_24539.cpp: In function 'int main()':
0_0_34484611_24539.cpp:36:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_34484611_24539.cpp:48:3: error: 'cout' was not declared in this scope
   cout<<a<<' '<<phin<<' '<<n<<endl;
   ^
0_0_34484611_24539.cpp:48:31: error: 'endl' was not declared in this scope
   cout<<a<<' '<<phin<<' '<<n<<endl;
                               ^
0_0_34484611_24539.cpp:49:39: error: 'printf' was not declared in this scope
   printf("%lld",((a*n)%mod+phin+a)%mod);
                                       ^