'''存在兩個指針,類似於頭指針和尾指針'''
class Node(object):
def __init__(self,item):
self.item=item
self.next=None
class LinkQueue(object):
def __init__(self):
n=Node(None)
self.head = n
self.rear = n
'''判斷是否爲空'''
def is_empty(self):
return self.head is self.rear
'''進隊列'''
def push(self,item):
node = Node(item)
self.rear.next = node
self.rear = node
'''出隊列'''
def pop(self):
if self.is_empty():
print('隊列爲空')
return
else:
t = self.head.next
self.head.next = t.next
if self.rear == t:
self.rear = self.head
return t.item
'''返回隊列第一個元素'''
def gettop(self):
if self.is_empty():
print('隊列爲空')
return
else:
return self.head.next.item
'''遍歷隊列內的所有元素'''
def printqueue(self):
if self.is_empty():
print('隊列爲空')
return
else:
while self.head!=self.rear:
result=self.pop()
print(result,end=' ')
'''創建隊列'''
def creatqueue(self):
data=input('請輸入,以 # 結束:')
while data!='#':
self.push(data)
data = input('請輸入,以 # 結束:')
if __name__=="__main__":
l=LinkQueue()
l.creatqueue()
print(l.gettop())