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golang int 转float 强转和高精度转操作

时间:2021-04-23 09:30:45 | 栏目:Golang | 点击:

golang int 转float

方法一:

强转:

代码如下:

import "fmt"
func main() {
 var money int
 money = 1
 fmt.Println(float64(money) / float64(100))
}

输出结果:0.01

方法二:

高精度转:

代码如下:

import (
 "fmt"
 "math/big"
 "strconv"
)
func main() {
 totalAmount := 1
 numrator, _ := new(big.Float).SetPrec(uint(1024)).SetString(strconv.Itoa(totalAmount))
 denominator := big.NewFloat(100)
 denominator1 := numrator.Quo(numrator, denominator)
 fmt.Println(denominator1)
}

输出结果:0.01

补充:golang float32/64与[]byte互转

网络协议开发中经常需要将int、float、bool等转为二进制数据,float32、64 与[]byte处理:

import (
  "encoding/binary"
  "math"
)
 
func Float32ToByte(float float32) []byte {
  bits := math.Float32bits(float)
  bytes := make([]byte, 4)
  binary.LittleEndian.PutUint32(bytes, bits)
 
  return bytes
}
 
func ByteToFloat32(bytes []byte) float32 {
  bits := binary.LittleEndian.Uint32(bytes)
 
  return math.Float32frombits(bits)
}
 
func Float64ToByte(float float64) []byte {
  bits := math.Float64bits(float)
  bytes := make([]byte, 8)
  binary.LittleEndian.PutUint64(bytes, bits)
 
  return bytes
}
 
func ByteToFloat64(bytes []byte) float64 {
  bits := binary.LittleEndian.Uint64(bytes)
 
  return math.Float64frombits(bits)
}

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