Go语言(Golang)环形队列

  1 package main
  2 
  3 import (
  4     "fmt"
  5     "errors"
  6     "os"
  7 )
  8 
  9 //管理环形队列的结构
 10 type Queue struct {
 11     maxSize int
 12     array [5]int
 13     head int
 14     tail int
 15 }
 16 
 17 //入队列
 18 func (this *Queue) Push(val int) (err error) {
 19     if this.IsFull() {
 20         return errors.New("队列已满！")
 21     }
 22     this.array[this.tail] = val
 23     this.tail = (this.tail + 1) % this.maxSize
 24     return
 25 }
 26 
 27 //出队列
 28 func (this *Queue) Pop() (val int, err error) {
 29     if this.IsEmpty() {
 30         return 0, errors.New("队列为空！")
 31     }
 32     val = this.array[this.head]
 33     this.head = (this.head + 1) % this.maxSize
 34     return
 35 }
 36 
 37 //显示队列
 38 func (this *Queue) Show() {
 39     if this.IsEmpty() {
 40         fmt.Println("队列为空！")
 41     }
 42     temp := this.head 
 43     for i := 0; i < this.Size(); i++ {
 44         fmt.Printf("array[%d]:%d\t",temp,this.array[temp])
 45         temp = (temp + 1) % this.maxSize
 46     }
 47 
 48 }
 49 
 50 //判断队列是否已满
 51 func (this *Queue) IsFull() bool {
 52     return (this.tail + 1) % this.maxSize == this.head
 53 }
 54 
 55 //判断队列是否为空
 56 func (this *Queue) IsEmpty() bool {
 57     return this.head == this.tail
 58 }
 59 
 60 //查询有多少个队列
 61 func (this *Queue) Size() int {
 62     return (this.tail + this.maxSize - this.head) % this.maxSize
 63 }
 64 
 65 
 66 
 67 
 68 func main(){
 69     
 70     quque := &Queue {
 71         maxSize : 5,
 72         head : 0,
 73         tail : 0,
 74     }
 75 
 76     var xz string
 77     var number int
 78     for {
 79         fmt.Println()
 80         fmt.Println("1.添加队列请输入add")
 81         fmt.Println("2.获取队列请输入get")
 82         fmt.Println("3.显示队列请输入show")
 83         fmt.Println("4.输入exit退出")
 84         fmt.Scanln(&xz)
 85 
 86         switch xz {
 87         case "add" :
 88             fmt.Println("输入你要入列的数：")
 89             fmt.Scanln(&number)
 90             err := quque.Push(number)
 91             if err != nil {
 92                 fmt.Println(err.Error())
 93             } else {
 94                 fmt.Printf("加入队列成功!\n")
 95             }
 96         case "get" :
 97             val, err := quque.Pop()
 98             if err != nil {
 99                 fmt.Println(err.Error())
100             } else {
101                 fmt.Printf("队列已取出：%d",val)
102             }
103             
104         case "show" :
105             quque.Show()
106             fmt.Println()
107         case "exit" :
108             os.Exit(0)
109         }
110     }
111 }