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Stacks & Queues in list

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Question

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Evaluate the following Postfix notation of expression:
4,2,*,22,5,6,+,/,-

Solution

Element	Stack Contents
4	4
2	4,2
*	8
22	8, 22
5	8, 22, 5
6	8, 22, 5, 6
+	8, 22, 11
/	8, 2
-	6

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Question

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Differentiate between file modes r+ and rb+ with respect to Python.

Solution

Difference b/w r+ and rb+ with respect to Python

r+	rb+
r+ Opens a file for both reading and writing. The file pointer placed at the beginning of the file.	rb+ Opens a file for both reading and writing in binary format. The file pointer placed at the beginning of the file.

Question

Wired Faculty App

Evaluate the following postfix notation of expression. Show status of the stack after every operation.
22,11,/,14,10,,+,5,2

Solution

Element	Stack
22	22
11	22, 11
/	2
14	2,14
10	2,14,10
-	2,4
+	6
5	6,5
-	1

Question

Wired Faculty App

Write a statement in Python to perform the following operations:

To open a text file “BOOK.TXT” in read mode

To open a text file “BOOK.TXT” in write mode

Solution

f1 = open('BOOK.TXT','r')
f2 = open('BOOK.TXT','w')

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