mirror of
https://github.com/shopspring/decimal.git
synced 2024-11-22 20:40:48 +01:00
67 lines
1.8 KiB
Markdown
67 lines
1.8 KiB
Markdown
# decimal [](https://travis-ci.org/shopspring/decimal)
|
|
|
|
Arbitrary-precision fixed-point decimal numbers in go.
|
|
|
|
NOTE: can "only" represent numbers with a maximum of 2^31 digits after the decmial point.
|
|
|
|
## Features
|
|
|
|
* the zero-value is 0, and is safe to use without initialization
|
|
* addition, subtraction, multiplication with no loss of precision
|
|
* division with specified precision
|
|
* database/sql serialization/deserialization
|
|
* json and xml serialization/deserialization
|
|
|
|
## Install
|
|
|
|
Run `go get github.com/shopspring/decimal`
|
|
|
|
## Usage
|
|
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/shopspring/decimal"
|
|
)
|
|
|
|
func main() {
|
|
price, err := decimal.NewFromString("136.02")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
quantity := decimal.NewFromFloat(3)
|
|
|
|
fee, _ := decimal.NewFromString(".035")
|
|
taxRate, _ := decimal.NewFromString(".08875")
|
|
|
|
subtotal := price.Mul(quantity)
|
|
|
|
preTax := subtotal.Mul(fee.Add(decimal.NewFromFloat(1)))
|
|
|
|
total := preTax.Mul(taxRate.Add(decimal.NewFromFloat(1)))
|
|
|
|
fmt.Println("Subtotal:", subtotal) // Subtotal: 408.06
|
|
fmt.Println("Pre-tax:", preTax) // Pre-tax: 422.3421
|
|
fmt.Println("Taxes:", total.Sub(preTax)) // Taxes: 37.482861375
|
|
fmt.Println("Total:", total) // Total: 459.824961375
|
|
fmt.Println("Tax rate:", total.Sub(preTax).Div(preTax)) // Tax rate: 0.08875
|
|
}
|
|
```
|
|
|
|
## Documentation
|
|
|
|
http://godoc.org/github.com/shopspring/decimal
|
|
|
|
## Production Usage
|
|
|
|
* [Spring](https://shopspring.com/), since August 14, 2014.
|
|
* If you are using this in production, please let us know!
|
|
|
|
## License
|
|
|
|
The MIT License (MIT)
|
|
|
|
This is a heavily modified fork of [fpd.Decimal](https://github.com/oguzbilgic/fpd), which was also released under the MIT License.
|