mirror of
https://github.com/shopspring/decimal.git
synced 2024-10-06 00:45:55 +02:00
67 lines
1.8 KiB
Markdown
67 lines
1.8 KiB
Markdown
# decimal [](https://travis-ci.org/shopspring/decimal)
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Arbitrary-precision fixed-point decimal numbers in go.
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NOTE: can "only" represent numbers with a maximum of 2^31 digits after the decmial point.
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## Features
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* the zero-value is 0, and is safe to use without initialization
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* addition, subtraction, multiplication with no loss of precision
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* division with specified precision
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* database/sql serialization/deserialization
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* json and xml serialization/deserialization
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## Install
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Run `go get github.com/shopspring/decimal`
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## Usage
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```go
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package main
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import (
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"fmt"
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"github.com/shopspring/decimal"
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)
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func main() {
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price, err := decimal.NewFromString("136.02")
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if err != nil {
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panic(err)
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}
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quantity := decimal.NewFromFloat(3)
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fee, _ := decimal.NewFromString(".035")
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taxRate, _ := decimal.NewFromString(".08875")
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subtotal := price.Mul(quantity)
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preTax := subtotal.Mul(fee.Add(decimal.NewFromFloat(1)))
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total := preTax.Mul(taxRate.Add(decimal.NewFromFloat(1)))
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fmt.Println("Subtotal:", subtotal) // Subtotal: 408.06
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fmt.Println("Pre-tax:", preTax) // Pre-tax: 422.3421
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fmt.Println("Taxes:", total.Sub(preTax)) // Taxes: 37.482861375
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fmt.Println("Total:", total) // Total: 459.824961375
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fmt.Println("Tax rate:", total.Sub(preTax).Div(preTax)) // Tax rate: 0.08875
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}
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```
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## Documentation
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http://godoc.org/github.com/shopspring/decimal
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## Production Usage
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* [Spring](https://shopspring.com/), since August 14, 2014.
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* If you are using this in production, please let us know!
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## License
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The MIT License (MIT)
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This is a heavily modified fork of [fpd.Decimal](https://github.com/oguzbilgic/fpd), which was also released under the MIT License.
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