The number of binary digits in the usual representation of a positive integer : . The bit length of zero is conventionally zero in integer programming interfaces.
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Bit-length, often referred to in the context of binary numbers or digital data, is the number of bits required to represent a given value in binary form. It indicates how many binary digits (0s and 1s) are needed to express a number. For example: - The decimal number `5` is represented in binary as `101`, which has a bit-length of 3.