Answer 1

That's a simple one. Please try first to make a code and if you gets difficulty, you can ask here. But I have wrote it for you. Next time try yourself first.

The code starts here.
int a , b;
cin >> a ;cin >>b;
cout << "The sum of the both digits is : "<< (a+b);
cout << "The difference of the both digits is : " << (a-b);