Rahul is a computer programmer who runs a program to transfer the decimal points of thousands of customer accounts of a bank to his personal account. After running the program, the balance in a customer’s account would change to whole numbers (any numbers in the balance after the decimal point will get transferred to Rahul’s personal account). Every month, Rahul gains several thousands of dollars by just pressing a button.

Based on the above reading, recommend how to prevent similar problems in the future.