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Bit numbering
In computing, bit numbering (or sometimes bit endianness) is the convention used to identify the bit positions in a binary number or a container for such a value. The bit number starts with zero and is incremented by one for each subsequent bit position.
==LSB 0 bit numbering==
When the bit numbering starts at zero for the least significant bit the numbering scheme is called "LSB 0". This bit numbering method has the advantage that for any unsigned number the value of the number can be calculated by using exponentiation with the bit number and a base of 2. The value of an unsigned binary integer is
where ''ai'' denotes the value of the bit with number ''i'' and ''N'' denotes the number of bits in total.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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