Golang 打印不需要的值

Question

我是 GoLang 的新手，正在尝试编写这个程序 -

程序应该写成一个循环。在进入循环之前，程序应该创建一个大小（长度）为 3 的空整数切片。在每次通过循环期间，程序都会提示用户输入要添加到切片中的整数。程序将整数添加到切片中，对切片进行排序，并按排序顺序打印切片的内容。切片的大小必须增加以容纳用户决定输入的任意数量的整数。当用户输入字符“X”而不是整数时，程序应该只退出（退出循环）。

所以我的代码是 -

package main

import (

    "fmt"

    "sort"

    "strconv"

)

func main() {

    mySlice := make([]int, 3)

    var input string

    for i := 0; i < len(mySlice); i++ {

        fmt.Println("Please enter a number")

        fmt.Scanln(&input)

        if input == "X" {

            break

        }

        mySlice_var, err := strconv.Atoi(input)

        if err != nil {

            fmt.Println("Wrong input")

            continue

        }

        // mySlice[i] = mySlice_var

        mySlice = append(mySlice, mySlice_var)

        // mySlice[i] = mySlice_var

        sort.Ints(mySlice)

        fmt.Println(mySlice)

    }

}

例如，如果我先输入 4，然后输入 5，然后输入 1，它将打印我

Please enter a number

4

[0 0 0 4]

Please enter a number

5

[0 0 0 4 5]

Please enter a number

1

[0 0 0 1 4 5]

看起来它可以打印并排序，但是我如何摆脱前三个“0”？谢谢！

Answer 1

希望这是您想要打印的方式！（迭代切片，只打印非零值），试试这个！package mainimport (&nbsp; &nbsp; &nbsp; &nbsp; "fmt"&nbsp; &nbsp; &nbsp; &nbsp; "sort"&nbsp; &nbsp; &nbsp; &nbsp; "strconv")func main() {&nbsp; &nbsp; &nbsp; &nbsp; mySlice := make([]int, 3)&nbsp; &nbsp; &nbsp; &nbsp; var input string&nbsp; &nbsp; &nbsp; &nbsp; for i := 0; i < len(mySlice); i++ {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Println("Please enter a number")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Scanln(&input)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if input == "X" {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mySlice_var, err := strconv.Atoi(input)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if err != nil {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Println("Wrong input")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; continue&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // mySlice[i] = mySlice_var&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mySlice = append(mySlice, mySlice_var)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // mySlice[i] = mySlice_var&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sort.Ints(mySlice)//&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Println(mySlice)//Iterating Over Slice , and printed only non zero values&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for _,v := range mySlice{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if v != 0 {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Printf("%v",v)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fmt.Println("")&nbsp; &nbsp; &nbsp; &nbsp; }}

Answer 2

mySlice := make([]int, 3)它很好地初始化一个切片，它的大小是3，然后附加3个零来初始化它像这样打印：fmt.Println(mySlice)fmt.Println("len: ", len(mySlice))fmt.Println("cap: ", cap(mySlice))[0 0 0]len:&nbsp; 3cap:&nbsp; 3你只能初始化 init capmySlice := make([]int, 0, 3)fmt.Println(mySlice)fmt.Println("len: ", len(mySlice))fmt.Println("cap: ", cap(mySlice))[]len:&nbsp; 0cap:&nbsp; 3