Computer Codes Computer professionals use different number systems according to their requirements to communicate with the computer system. All the number systems used by computer professionals to interact with computer systems come under the category of positional number system. The positional number system is a number system in which numbers are represented using some symbols called digits and the values of these numbers can be determined by taking the position of digits into consideration.Computer Codes ◼ Computer professionals use different number systems according to their requirements to communicate with the computer system. ◼ All the number systems used by computer professionals to interact with computer systems come under the category of positional number system. ◼ The positional number system is a number system in which numbers are represented using some symbols called digits and the values of these numbers can be determined by taking the position of digits into consideration