Int len= 0, i, sum= 0, checksum= 0, mod9= 0 Fraction form was used when MICR form was not invented, however it is still used as a backup.įunction to validate a USPS money order number Routing number appears in two formats: ) Fraction form and MICR (Magnetic ink character recognition) form. The RTN is also used by Federal Reserve Bank to process Fedwire fund transfers, and by the Automatic Clearing house to process directĭeposits and other automatic transfers. Routing number is a nine digit bank code designed to facilitate the sorting, bundling, and shipment of paper checks back to the drawer’sĪccount. Len = strlen(a) //length of the string passed We have already discussed this algorithm, so we will not go into theĬ implementation of mod10 (Luhn's Algorithm): Mod10 algorithm is used to verify bank card numbers. Verifying the card number using mod10 algorithm The numbers left are issued by the bank and the The first six digits of the card number (including the MII) is known as the Issuer Identification number (IIN).Įxamples - 4 stands for Visa, 51 or 55 stand for MasterCard, and 34 or 37 for American Express. If the number begins with 4, 5, or 6, it is issued byĪnd banking industry. The first digit of the card number is the Major Industry Identified (MII), which tells us which category of the entity issued the card.įor example, if the number begins with 1 or 2, it’s issued by Airlines industry. Gift cards can also be verified with Luhn’s algorithm.
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