C++

Write a program that inputs from the user three numbers = the number of mattresses in stock at the beginning of the month, the number of mattresses purchased during the month, and the number of mattresses sold during the month. The program should return the total number of mattresses currently in stock. Remember, you should always output to the user in textual form what is expected for keyboard entry. Make sure you have appropriate comments and output to explain the program's function. After completion and testing, zip the folder and submit via the Assignments link in BlackBoard. You should browse and attach the folder via the browse my computer button and then select the submit button. The final date/time to submit assignments in this folder is Friday, February 10th at midnight