Modify Listing 172 To Display The Movie List Properly

modify Listing 172 so that it displays the movie list both in the original

The task involves enhancing a C program that manages a list of movies to display the list both in its original order and in reverse order. The original program uses an array of structures to store movie titles and ratings, and it reads input from the user until the array is full or the user inputs an empty line. To accomplish the objective, we will modify the program to include a linked list structure that allows bidirectional traversal or use recursion to print the list in reverse without changing the original array structure. For simplicity and clarity, using a linked list with previous and next pointers is an effective approach to display the list forwards and backwards efficiently. This modification will demonstrate the use of dynamic memory allocation, pointer manipulation, and linked list traversal in C.

Paper For Above instruction

The program initially provided offers a straightforward approach to storing a list of movies using a fixed-size array of structures. While it effectively manages input and output for the movies, it lacks the capability to display the list in reverse order without re-traversing the list from the beginning or resorting to recursion. To rectify this, implementing a doubly linked list allows for efficient traversal in both directions. This approach enables the program to display the movie list in its original order and then in reverse order seamlessly.

The first step involves defining a new structure for linked list nodes. Each node contains the movie data and pointers to the previous and next nodes. The program reads user input similarly, but instead of storing the movies solely in an array, it creates nodes dynamically and links them to form a doubly linked list. The head of the list points to the first node, and each node points to its successor and predecessor.

Once the list is built, traversal in the forward direction is straightforward by starting at the head and following the next pointers. To display the list in reverse, the program first traverses to the last node by following next pointers, then iterates backward using the previous pointers. This design makes it easy to display the list both in the original and reverse order without re-reading input or resorting to recursion.

Alternatively, if the linked list approach is deemed complex, recursion provides a neat way to print the list in reverse. After building the list or array, a recursive function can be invoked starting from the first node or array element, printing the current data after the recursive call returns. This naturally results in the data being printed in reverse order.

In conclusion, modifying the existing program by incorporating a doubly linked list structure enhances functionality by supporting traversal in both directions. It aligns with good programming practices by demonstrating dynamic memory usage, pointer management, and bidirectional list traversal. Whether using a linked list or recursion, both methods effectively extend the program's capability to display the movie list in reverse order, enriching the user experience and demonstrating key concepts in C programming.

References

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• ISO/IEC 14882:2017(E). Programming Languages — C++. (For references on list implementations)
• Yardley, John. (2018). C Programming Advanced. Educational Publishing.