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APS105

APS105. Lists. Structures. Structures. Arrays allow a collection of elements All of the same type How to collect elements of different types? Structures; in C: struct General form: struct { <variable declarations> } <identifier list>;. Example.

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APS105

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  1. APS105 Lists

  2. Structures

  3. Structures • Arrays allow a collection of elements • All of the same type • How to collect elements of different types? • Structures; in C: struct • General form: struct { <variable declarations> } <identifier list>;

  4. Example • A struct of stock items at a store: .

  5. Separate Definition from Declaration .

  6. Using Typedef • Can define your own types using typedef! • General form: typedef <type> <yourTypeName>; • Examples: .

  7. Doing typedef and definition at once: .

  8. Referencing Struct Members .

  9. Structs and Pointers StockItem x; StockItem *p; p = &x; // p points to x // ways to set quantity to 500: .

  10. Malloc a Struct (StockItem) .

  11. Lists

  12. Intro • A list is a sequence of items • can implement lists different ways: • a group of variables • an array • using pointers (as we will see) • Typical list operations • start a new, empty list • insert a new element into the list • find an item with a certain value in the list • delete an item from the list • print the list • Abstract Data Type (ADT) • A list is an example of an ADT • An ADT is a concept • there are multiple ways to implement an ADT

  13. The Problem with Arrays • Insert an item into the middle of the list: • Delete an item from the middle of the list: • What if the array isn’t big enough? 9 X 9

  14. Flexible List: “Linked List” • Insert an item into the middle of the list: • Delete an item from the middle of the list: 5 3 1 6 2 6 7 5 3 1 6 2 6 7 9 5 3 1 6 2 6 7 X

  15. Implementing a Linked List of ints .

  16. Allocating a new Node • a function to allocate & initialize a node .

  17. Creating a List: Adding to the end .

  18. Creating a List: Adding to the front .

  19. Function to Print a List .

  20. Deleting the First Node of a List myList info: 5 link: info: 3 link: info: 1 link:

  21. Function to Delete first Node .

  22. Delete first Node: return new head .

  23. Function to return true if an item found .

  24. Function to Delete Entire List .

  25. Function to Add Element to End of List .

  26. Deleting the Last Node of a List myList info: 5 link: info: 3 link: info: 1 link:

  27. Function to Delete Last Element .

  28. Inserting into an Ordered List myList info: 1 link: info: 3 link: info: 5 link: 4

  29. Function to Insert into Ordered List .

  30. Using Recursion on Lists

  31. Printing a List using Recursion • can think of a list recursively as: a head node plus a list .

  32. Deleting a List using Recursion .

  33. Finding an Item using Recursion .

  34. Compare 2 Lists: true if identical .

  35. Insert into an Ordered List .

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