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Objectives

Chapter 9 Pointers. Objectives. ❏ To understand the concept and use of pointers ❏ To be able to declare, define, and initialize pointers ❏ To write programs that access data through pointers

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Objectives

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  1. Chapter 9 Pointers Objectives ❏ To understand the concept and use of pointers ❏ To be able to declare, define, and initialize pointers ❏ To write programs that access data through pointers ❏ To use pointers as parameters and return types ❏ To understand pointer compatibility, especially regarding pointers to pointers ❏ To understand the role of quality in software engineering Computer Science: A Structured Programming Approach Using C

  2. FIGURE 9-1 Derived Types Computer Science: A Structured Programming Approach Using C

  3. 9-1 Introduction A pointer is a constant or variable that contains an address that can be used to access data. Pointers are built on the basic concept of pointer constants. Topics discussed in this section: Pointer Constants Pointer Values Pointer Variables Accessing Variables Through PointersPointer Declaration and DefinitionDeclaration versus Redirection Initialization of Pointer Variables Computer Science: A Structured Programming Approach Using C

  4. FIGURE 9-2 Character Constants and Variables Computer Science: A Structured Programming Approach Using C

  5. FIGURE 9-3Pointer Constants Computer Science: A Structured Programming Approach Using C

  6. Note Pointer constants, drawn from the set of addresses for a computer, exist by themselves. We cannot change them; we can only use them. Computer Science: A Structured Programming Approach Using C

  7. Note An address expression, one of the expression types in the unary expression category, consists of an ampersand (&) and a variable name. Computer Science: A Structured Programming Approach Using C

  8. FIGURE 9-4 Print Character Addresses Computer Science: A Structured Programming Approach Using C

  9. Note A variable’s address is the first byte occupied by the variable. Computer Science: A Structured Programming Approach Using C

  10. FIGURE 9-5 Integer Constants and Variables Computer Science: A Structured Programming Approach Using C

  11. FIGURE 9-6 Pointer Variable Computer Science: A Structured Programming Approach Using C

  12. FIGURE 9-7 Multiple Pointers to a Variable Computer Science: A Structured Programming Approach Using C

  13. Note A pointer that points to no variable contains the special null-pointer constant, NULL. Computer Science: A Structured Programming Approach Using C

  14. Note An indirect expression, one of the expression types in the unary expression category, is coded with an asterisk (*) and an identifier. Computer Science: A Structured Programming Approach Using C

  15. FIGURE 9-8 Accessing Variables Through Pointers Computer Science: A Structured Programming Approach Using C

  16. FIGURE 9-9 Address and Indirection Operators Computer Science: A Structured Programming Approach Using C

  17. FIGURE 9-10 Pointer Variable Declaration Computer Science: A Structured Programming Approach Using C

  18. FIGURE 9-11 Declaring Pointer Variables Computer Science: A Structured Programming Approach Using C

  19. PROGRAM 9-1 Demonstrate Use of Pointers Computer Science: A Structured Programming Approach Using C

  20. PROGRAM 9-1 Demonstrate Use of Pointers Computer Science: A Structured Programming Approach Using C

  21. FIGURE 9-12 Uninitialized Pointers Computer Science: A Structured Programming Approach Using C

  22. FIGURE 9-13 Initializing Pointer Variables Computer Science: A Structured Programming Approach Using C

  23. PROGRAM 9-2 Fun with Pointers Computer Science: A Structured Programming Approach Using C

  24. PROGRAM 9-2 Fun with Pointers Computer Science: A Structured Programming Approach Using C

  25. PROGRAM 9-2 Fun with Pointers Computer Science: A Structured Programming Approach Using C

  26. FIGURE 9-14Add Two Numbers Using Pointers Computer Science: A Structured Programming Approach Using C

  27. PROGRAM 9-3 Add Two Numbers Using Pointers Computer Science: A Structured Programming Approach Using C

  28. PROGRAM 9-3 Add Two Numbers Using Pointers Computer Science: A Structured Programming Approach Using C

  29. FIGURE 9-15 Demonstrate Pointer Flexibility Computer Science: A Structured Programming Approach Using C

  30. PROGRAM 9-4 Using One Pointer for Many Variables Computer Science: A Structured Programming Approach Using C

  31. PROGRAM 9-4 Using One Pointer for Many Variables Computer Science: A Structured Programming Approach Using C

  32. FIGURE 9-16 One Variable with Many Pointers Computer Science: A Structured Programming Approach Using C

  33. PROGRAM 9-5 Using A Variable with Many Pointers Computer Science: A Structured Programming Approach Using C

  34. PROGRAM 9-5 Using A Variable with Many Pointers Computer Science: A Structured Programming Approach Using C

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