h2-computing-notes/code/data_structures/queue_static_list.py at main · LimMengShin/h2-computing-notes · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
class Queue:
    def __init__(self, max_size):
        self.max_size = max_size
        self.front = 0
        self.rear = -1
        self.queue = [None]*max_size

    def is_empty(self):
        return self.rear < self.front

    def is_full(self):
        return self.rear == self.max_size-1

    def enqueue(self, data):
        if self.is_full():
            print("queue full, cannot enqueue")
        else:
            self.rear += 1
            self.queue[self.rear] = data

    def dequeue(self):
        if self.is_empty():
            return "queue empty, cannot dequeue"
        else:
            self.front += 1
            return self.queue[self.front-1]

    def printQueue(self):
        if self.is_empty():
            print("queue empty")
        else:
            for i in range(self.front, self.rear+1):
                print(self.queue[i], end=" ")
            print(" ")

    def display_raw(self):
        print(self.queue)

#main
queue1 = Queue(3)
queue1.display_raw()
queue1.printQueue()

#insert 1 item
print("Enqueue a:")
queue1.enqueue('a')
queue1.display_raw()
queue1.printQueue()

#insert 1 item
print("Enqueue b:")
queue1.enqueue('b')
queue1.display_raw()
queue1.printQueue()

#delete 1 item
print("Dequeue:")
print("Deleted: " + queue1.dequeue())
queue1.display_raw()
queue1.printQueue()

#delete 1 item
print("Dequeue:")
print("Deleted: " + queue1.dequeue())
queue1.display_raw()
queue1.printQueue()

#delete 1 item
print("Dequeue:")
print("Deleted: " + queue1.dequeue())
queue1.display_raw()
queue1.printQueue()

#insert 1 item
print("Enqueue c:")
queue1.enqueue('c')
queue1.display_raw()
queue1.printQueue()

#insert 1 item
print("Enqueue d:")
queue1.enqueue('d')
queue1.display_raw()
queue1.printQueue()