In computing, bit numbering is the convention used to identify the bit positions in a binary number. 展开

The expressions most significant bit first and least significant bit at last are indications on the ordering of the sequence of the bits in the … 展开

When the bit numbering starts at zero for the least significant bit (LSb) the numbering scheme is called LSb 0. This bit numbering method has the advantage that for any 展开

LSb of a number can be calculated with time complexity of $${\displaystyle O(n)}$$ with formula $${\displaystyle a\And (\sim a+1)}$$, where 展开

In computing, the least significant bit (LSb) is the bit position in a binary integer representing the binary 1s place of the integer. Similarly, the most significant bit (MSb) represents the highest-order place of the binary integer. The LSb is sometimes referred to as … 展开

When the bit numbering starts at zero for the most significant bit (MSb) the numbering scheme is called MSb 0.
The value of an unsigned binary integer is therefore 展开

For MSb 1 numbering, the value of an unsigned binary integer is
$${\displaystyle \sum _{i=1}^{N}b_{i}\cdot 2^{N-i}}$$
PL/I numbers BIT strings starting with 1 for the leftmost bit.
The Fortran 展开