如何在GO中将float64值修整为特定的小数点？ [重复]

Question

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• Golang Round to Nearest 0.05 1 answer

I want to trim latitude and longitude of address upto 5 decimal points. latitude and longitude are of type float64 I have created a function round the value. My function is like this::

func DoubleRoundFive(val float64) float64 {
    formattedVal := fmt.Sprintf("%.5f", val)
    roundedVal, _ := strconv.ParseFloat(formattedVal, 64)
    return roundedVal
}

Output and usage::

DoubleRoundFive(76.70289609999999)

Output::

76.7029

But I just want to trim the value upto 5 decimal points. I want output as 76.70289 . Is it possible in GO?? I want exact 5 decimal values because I am using this for latitude longitude. This is a GO playground Link

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Answer 1

Try this:

package main

import (
    "fmt"

)

func main() {
    val := DoubleRoundFive(76.70289609999999)
    fmt.Println(val)
}

func DoubleRoundFive(val float64) float64 {
    valInt := int64(val*100000)
    val = float64(valInt)/100000
    return val
}

Go Playground: https://play.golang.org/p/O_H_buvJtDO