float_array.go

package app

import (

    "fmt"

    "log"

    "sort"

    "strconv"

    "strings"

)

//这个文件相关的代码不需要解释了吧！！！

type FloatArray []float64

func (a *FloatArray) Set(param string) error {

    for _, s := range strings.Split(param, ",") {

        v, err := strconv.ParseFloat(s, 64)

        if err != nil {

            log.Fatalf("Could not parse: %s", s)

            return nil

        }

        *a = append(*a, v)

    }

    sort.Sort(*a)

    return nil

}

func (a FloatArray) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

func (a FloatArray) Less(i, j int) bool { return a[i] > a[j] }

func (a FloatArray) Len() int           { return len(a) }

func (a *FloatArray) String() string {

    var s []string

    for _, v := range *a {

        s = append(s, fmt.Sprintf("%f", v))

    }

    return strings.Join(s, ",")

}

float_array.go

原文：http://www.cnblogs.com/zhangboyu/p/7457411.html