38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
# lua-big-number
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A simple big number library for Lua, inspired by https://github.com/Patashu/break_infinity.js
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## Features
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1. floating-point precision in the range [~e-e14 - ~ee14]
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2. Hard limit should be about ee308, or 10^2¹⁰²⁴
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3. method names identical or very similar to https://github.com/Patashu/break_infinity.js
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4. non-mutable methods -> easy chaining `Big:new(2):add(Big:new(2)):mul(Big:new(2))`
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5. Operator overloading `Big:new(3) * Big:new(5) ^ 2`
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## Usage
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1. Add `bignumber.lua` into your project
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2. `Big = dofile("/path/to/bignumber.lua")`
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## Example
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```lua
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Big = dofile("lua-big-number/bignumber.lua")
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local big1 = Big:new(100)
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local big2 = Big:new(10)
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local added = big1:add(big2)
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print(added) -- will output 1.1e2
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print(big1 * big2) -- will output 1.0e3
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print(big1 + (big1 * big2 - big2) / (big1 ^ 0.4)) -- will output 2.5690442605365e2
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-- comparisons
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print(big1 > big2) -- true
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print(big1 == big2) -- false
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-- You can define a shorthand for Big:new()
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local N = function(n) return Big:new(n) end
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print(N(2) ^ 4096 / N("4.3e401")) -- 2.4288113521237e831
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``` |