View Compilation Error

0_0_34484600_30917.cpp: In function 'int main()':
0_0_34484600_30917.cpp:35:2: error: 'cout' was not declared in this scope
  cout<<(inv(2)*2)%mod<<' '<<(inv(3)*3)%mod<<endl;
  ^
0_0_34484600_30917.cpp:35:45: error: 'endl' was not declared in this scope
  cout<<(inv(2)*2)%mod<<' '<<(inv(3)*3)%mod<<endl;
                                             ^
0_0_34484600_30917.cpp:37:15: error: 'scanf' was not declared in this scope
  scanf("%d",&T);
               ^
0_0_34484600_30917.cpp:50:39: error: 'printf' was not declared in this scope
   printf("%lld",((a*n)%mod+phin+a)%mod);
                                       ^