Page 375 - Computer Science V2.0 Class 11

Case-based Questions

1. Shilpi finds programs on strings interesting. Her most recent programming challenge requires her to take a string that
may contain several words (possibly zero) and return a new string with the first letter of each word in the original text
capitalized. Assist Shilpi in finishing the job.
Ans. To develop the desired function, Shilpi should follow the following approach:
a. Split the input text into a list of individual words. Use the method split().
b. Capitalise the first letter of each word in the list and append it to an initially empty list. Use the method capitalize().
c. Join the capitalised words back into a single string. Use the method join() with a space as the separator.
Now the function can be developed as follows:
def capitalise(text):
'''
Objective: To capitalise the first letter of each word in text.
Input Parameters: text - string
Return Value: capitalisedText - string
'''
words = text.split()
capitalisedWords= []
for word in words:
capitalisedWords.append(word.capitalize())
capitalisedText = ' '.join(capitalisedWords)
return capitalisedText

text = input("Enter a string of alphabets: ")
capitalisedText = capitalise(text)
print("The new sentence is ", capitalisedText)
Sample execution of the function:
Enter a string: honesty is the best policy
Modified string: Honesty Is The Best Policy
2. Thomas is working on a word processor. He finds the toggle case feature very interesting. Along similar lines, he wants to
create a program in Python that will accept a string in lowercase as input and capitalize every alternate character of the
string. Help him complete the task.
Ans. To develop the desired function, Thomas needs to create a new string using the following approach:
a. Find length of the given word using the function len().
b. Intialise the desired toggle word (toggleWord) as null string.
c. for each character in the original string,
i. if it is placed at even index:
append it as it to toggleWord
ii. else:
Capitalize the character and append to toggleWord
Now the function can be developed as follows:
def toggleCase(word):
'''
Objective: To capitalize every alternate alphabet of a word
Input Parameters: word - string
Return Value: alternateCaseWord - string
'''

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