Question

Which of the following statements removes the “Atlanta” key and its correspond¬ ing value from the citystate database, which is tied to the %city hash? a. delete ( %city {Atlanta} ) ; b. delete ( $city{Atlanta} ) ; c. delete ( $citystate{Atlanta} ) ; d. None of the above.

Name: Problem 8, Chapter 9: CGI/Perl (Web Warrior Series)
Uploaded: 2025-09-04T23:19:45-08:00
Duration: 1 min 15 s
Channel: James Kiss
Description: Which of the following statements removes the “Atlanta” key and its correspond¬ ing value from the citystate database, which is tied to the %city hash? a. delete ( %city {Atlanta} ) ; b. delete ( city{Atlanta} ) ; c. delete ( citystate{Atlanta} ) ; d. None of the above.

   Which of the following statements removes the “Atlanta” key and its correspond¬
ing value from the citystate database, which is tied to the %city hash?
a. delete ( %city {Atlanta} ) ;
b. delete ( $city{Atlanta} ) ;
c. delete ( $citystate{Atlanta} ) ;
d. None of the above.

CGI/Perl (Web Warrior Series)

Diane Zak 1st Edition

Chapter 9, Problem 8

Instant Answer

Solved by Expert James Kiss

09/04/2025

Step 1

The citystate database is tied to the %city hash, which means that the keys in the %city hash correspond to values in the citystate database. Now, let's analyze the statements: a. delete ( %city {Atlanta} ) ; This statement tries to delete the key "Atlanta" Show more…

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Which of the following statements removes the “Atlanta” key and its correspond¬ ing value from the citystate database, which is tied to the %city hash? a. delete ( %city {Atlanta} ) ; b. delete ( $city{Atlanta} ) ; c. delete ( $citystate{Atlanta} ) ; d. None of the above.

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Key Concepts

Hashes

A hash is a data structure, especially common in languages like Perl, that stores data in key-value pairs. It allows for efficient retrieval, insertion, and deletion of values based on a unique key.

Variable Sigils in Perl

In Perl, different types of variables are distinguished by sigils. Hash variables are prefixed with a '%' symbol, while individual elements of a hash are accessed using the '$' symbol along with the key inside braces, which highlights how the overall hash structure is accessed versus the individual scalar values.

Deleting a Key-Value Pair

Deleting a key-value pair from a hash is performed using the 'delete' function in Perl. This function takes an expression that specifies the hash element to remove, and it properly handles the removal of the key along with its associated value from the hash.

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