C++ show the entire code please with explanation

Question 1: Write a recursice function called write vertical which receives a positive integer number as an argument and displays this number with its digits written vertically, so that for example, 1965 (the year "Satisfaction" was released) would be written as: To get you in the 'recursive' frame of mind, we can decompose the task as follows: 1. Output all of the digits except the last digita like this: 2. Output the last digit, which in this example is 5