Golang实现整型栈

package main

import (
    "fmt"
    "errors"
)

type Stack struct {
    Size int 
    Top  int 
    arr  [5]int
}


const INT_MAX = int(^uint(0) >> 1)


func (self *Stack) Push(ele int) (err error) {
    if self.Top == self.Size - 1 {
        err = errors.New("Stack full error!!")
        return
    } 
    
    self.Top++
    self.arr[self.Top] = ele
    return
}


func (self *Stack) Pop() (val int, err error) {
    val = -INT_MAX
    if self.Top == -1 {
        err = errors.New("Stack empty error!!")
        return
    }
    
    val = self.arr[self.Top]
    self.Top--
    return
}


func (self *Stack) List() {
    if self.Top == -1 {
        fmt.Println("Stack empty!!")
        return 
    }
    
    curPos := self.Top
    for ;curPos!=-1; {
        fmt.Println(self.arr[curPos])
        curPos--
    }
}


func main() {
    stack := &Stack{
        Size: 5,
        Top: -1,
    }
    
    stack.Push(1)
    stack.Push(2)
    stack.Push(3)
    stack.Push(4)
    stack.Push(5)
    fmt.Println("Current stack")
    stack.List()
    fmt.Println()
    val, err := stack.Pop()
    val, err = stack.Pop()
    val, err = stack.Pop()
    val, err = stack.Pop()
    
    if err!=nil {
        panic(err)
    }
    fmt.Printf("Current Pop: %d\n", val)
}

程序输出如下，

image.png