there is a programming code for it which takes 16 digit as input , plays with it in a c programme and gives a 4 digit output...........
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It is not called an ATM Password. It is called only an ATM PIN. PIN Stands for a Personal Identification Number and it is usually a 4 (or more) digit number which is specific to a customer bank account & ATM card combination. It does not contain any characters or alphabets and hence it is not a password.
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4 digits
Four characters.
The PIN, or personal identification number, associated with an ATM card is a four digit code to access the count. One should take care to keep the PIN in a safe place as to not risk theft.