如何在 Golang 中将 []string 转换为 []float64？

Question

我是编程新手，并试图用 Go 编写一个简单的普通程序。

package main

import (

    "fmt"

    "os"

)

var numbers []float64

var sum float64 = 0

func main() {

    if len(os.Args) > 1 {

        numbers = os.Args[1:]

    }

    fmt.Println("Numbers are: ", numbers)

    for _, value := range numbers {

        sum += value

    }

}

http://play.golang.org/p/TWNltPO71N

当我构建程序时，出现此错误：

prog.go:15: cannot use os.Args[1:] (type []string) as type []float64 in assignment

[process exited with non-zero status]

那么如何将一段字符串转换为一段浮点数呢？我可以将转换函数映射到切片吗？

Answer 1

您需要使用strconv.ParseFloat函数将字符串转换为 float64 ：package mainimport (&nbsp; &nbsp; "fmt"&nbsp; &nbsp; "os"&nbsp; &nbsp; "strconv")var numbers []float64var sum float64 = 0func main() {&nbsp; &nbsp; if len(os.Args) <= 1 {&nbsp; &nbsp; &nbsp; &nbsp; return&nbsp; &nbsp; }&nbsp; &nbsp; for _, arg := range os.Args[1:] {&nbsp; &nbsp; &nbsp; &nbsp; if n, err := strconv.ParseFloat(arg, 64); err == nil {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; numbers = append(numbers, n)&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; fmt.Println("Numbers are: ", numbers)&nbsp; &nbsp; for _, value := range numbers {&nbsp; &nbsp; &nbsp; &nbsp; sum += value&nbsp; &nbsp; }}

Answer 2

它无法转换，因为string和int不兼容。相反，具有的numbers片，只是迭代os.Args[1:]，使用ParseFloat从strconv包。fmt.Print("Numbers are: ")for _, arg := range os.Args[1:] {&nbsp; &nbsp; fmt.Print(arg, " ")&nbsp; &nbsp; value, err := strconv.ParseFloat(arg, 64)&nbsp; &nbsp; if err != nil {&nbsp; &nbsp; &nbsp; &nbsp; panic(err)&nbsp; &nbsp; }&nbsp; &nbsp; sum += value}