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Zero-Based Position Numbering in Sequences

Positions in a programming sequence are counted from zero, so the first item sits at position 0 and the last at one less than the count. A learner afterwards can convert between a human count and a zero-based position and name the item at a given position without off-by-one error.

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Zero-Based Numbering in Computer Science

Zero-based numbering (index origin = 0) is a convention in which the first element of a sequence is assigned index 0 rather than index 1, with the first element sometimes called the "zeroth" element.…