Golang截取小数位数

package main

import (

    "fmt"

    "strconv"

)

func main() {

    var ff float64

    ff = -1.355123156

    ff = FloatRound(ff, 4)

    fmt.Println(ff) // 输出 -1.3551

}

// 截取小数位数

func FloatRound(f float64, n int) float64 {

    format := "%." + strconv.Itoa(n) + "f"

    res, _ := strconv.ParseFloat(fmt.Sprintf(format, f), 64)

    return res

}