Figure 7.10 explains the working of a deque. Suppose
DEQ[1,6]
is Deque. e operations on the deque are
as follows.
• Initially deque is with three elements:
[1] [2] [3] [4] [5] [6]
10 20 30
FRONT=3
REAR=5
• Insert
40
at front and
50
at rear:
[1] [2] [3] [4] [5] [6]
40 10 20 30 50
FRONT=2
REAR=6
• Delete
30, 50
from the rear end:
[1] [2] [3] [4] [5] [6]
40 10 20
FRONT=2
REAR=4
• Insert
60, 70, 80
at the front end:
[1] [2] [3] [4] [5] [6]
60 40 10 20 80 70
FRONT=5
REAR=4
• Insert
90
at the rear end, insertion fails because the deque is full:
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