Given an integer array (or vector) with any size n, you are asked to compute the sum of the integer array in a recursive fashion. The programme performs the following tasks: 1. Prompt users to input a positive integer as n. 2. Validate n and prompt users to re-enter if not validate. 3. Create an array with size n and fill all slots of the array with random integers ranged from 1 to 2*n. 4. Apply a recursive method to compute the sum of the array. 5. Return and display the result.