.net Codes have been in existence since a long time before computers became a part of our lives. These .net codes have been used in almost all areas of human activity right from our family communication to military missions. Codes have been used in academics for students’ grade and class such as ‘Distinction’ signifying marks of 70% or above. The government has been using codes across its various activities like the postal services where a Postal Index Number (PIN) is used for towns with 411004 representing the Deccan Gymkhana area of Pune city.

These ubiquitous codes are used in the field of computers too, for several reasons like disk space saving, classification or collating, ease in sorting of records, self validation, uniformity in size, and many more. Likewise there have been different verities of codes like mnemonic, alphabetic, random, decimal, and chronological and so on. All this makes it essential that you learn about the codes in a systematic way before a system is designed, as the codes, if misused, could reduce the efficiency of the system and at times even result in data processing errors.

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