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Andrew Groot
20 lines
1008 B
Markdown
20 lines
1008 B
Markdown
# Script Integer Division
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The Bitcoin Script [OP_DIV](/protocol/blockchain/script#arithmetic) and [OP_MOD](/protocol/blockchain/script#arithmetic) operations are performed on script numbers, which are signed integers.
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However, there are multiple valid approaches to signed integer division, particularly with respect to how negative values are handled, so this must be disambiguated.
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The above operations follow [C](https://en.wikipedia.org/wiki/C_(programming_language))-style integer division semantics.
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For a given `numerator` and `denominator`, if `OP_DIV` returns `quotient` and `OP_MOD` returns `remainder`, the following relation be true: `numerator = quotient * denominator + remainder`.
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This allows for both negative quotients and remainders.
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The following examples may provide clarity:
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OP_DIV 5 2 -> 2
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OP_MOD 5 2 -> 1
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OP_DIV -5 2 -> -2
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OP_MOD -5 2 -> -1
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OP_DIV 5 -2 -> -2
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OP_MOD 5 -2 -> 1
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OP DIV -5 -2 -> 2
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OP_MOD -5 -2 -> -1
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