Page 260 - C++

CBSE AISSCE 2016-2017 Marking Scheme for Computer Science
(Sub Code: 083 Paper Code 91/1 Delhi)
(c) Write Addnew(Book) and Remove(Book) methods in Python to Add a new Book and 4
Remove a Book from a List of Books, considering them to act as PUSH and POP
operations of the data structure Stack.

Ans class stack:
Book=[]
def Addnew(self):
Name=input("Enter Book Name :")
stack.Book.append(Name)
def Remove(self):
if (stack.Book==[]):
print "Stack Empty"
else:
print "Deleted Book is : ",stack.Book.pop()
( ½ mark for Addnew header)
( ½ mark for accepting a Book from user)
( 1 mark for adding value in list)
( ½ mark for Remove header)
( ½ mark for checking empty list condition)
( ½ mark for displaying Book getting removed)
( ½ mark for removing Book)
NOTE:
Marks not to be deducted for methods written without using a class
(d) Write definition of a Method AFIND(CITIES) to display all the city names from a list 2

of CITIES, which are starting with alphabet A.
For example:
If the list CITIES contains
["AHMEDABAD","CHENNAI","NEW DELHI","AMRITSAR","AGRA"]

The following should get displayed
AHEMDABAD
AMRITSAR
AGRA
Ans def AFIND(CITIES):
for i in CITIES:
if i[0]=='A':

print i
( ½ mark function header)
( ½ mark for loop)
( ½ mark for checking condition of first letter A)
( ½ mark for displaying value)

(e) Evaluate the following Postfix notation of expression: 2
2,3,*,24,2,6,+,/,-

Ans
Element Stack Contents
2 2
3 2, 3
* 6
24 6, 24
2 6, 24, 2

Page #19 of 28