You can input data with
cin >> num;
The definition of "adding" the 2 arrays is unclear.
Perhaps you mean adding corresponding elements of each array.
You should show an example of how the program will behave.
But, more important, you should make an attempt to code this yourself, and then post your code if you have a problem.
Write a program to input data into two different arrays and then to add the two arrays and store the result in a third array.
