Answered: The function find_max_char takes one…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

The function find_max_char takes one string parameter, mystr. The function returns the character in mystr with the maximum ordinal value (the character that comes last in the ASCII alphabet, relative to the other characters in mystr). However, if mystr is the empty string, the function returns the Python object None.

Notice that we don't need the ord() function to compare ordinal values; we can use comparison operators. For example, "Z" > "C" is true because Z comes after C in the ASCII alphabet.

We need to "accumulate" the correct answer (max_char) and then return it:

First, if mystr is empty, return None
Then initialize max_char (accumulator variable) to the first character in mystr
Use a for loop to iterate ch over the characters in mystr
Each time a new maximum character is found (if ch > max_char), max_char is updated to "remember" that the new maximum is ch
Finally, return max_char

For example:

Test	Result
print(find_max_char("naproxen"))	x
print(find_max_char("Gorilla Glue"))	u
print(find_max_char(""))	None

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