1. © 2010 Pearson Addison-Wesley. All rights reserved. Addison Wesley is an imprint of Chapter 11: Structure and Union Types Problem Solving & Program Design in C Sixth Edition By Jeri R. Hanly & Elliot B. Koffman

2. 1-2 © 2010 Pearson Addison-Wesley. All rights reserved. 1-2 Structures and Union Types A database is a collection of information stored in a computers memory or in a disk file. A database is subdivided into records, which normally contains information regarding specific data objects. The structure of the record is determined by the structure of the objects data type.

3. 1-3 © 2010 Pearson Addison-Wesley. All rights reserved. 1-3 Structures and Union Types Define a structure type before it can be created or saved. #define STRSZ 10 typedef struct { char name[STRSZ]; double diameter; int moons; double orbit_time, rotation_time; } planet_t planet_t current_planet, previous_planet, blank_planet = {, 0, 0, 0, 0};

4. 1-4 © 2010 Pearson Addison-Wesley. All rights reserved. 1-4 Figure 11.1 Assigning Values to Components of Variable current_planet p569

5. 1-5 © 2010 Pearson Addison-Wesley. All rights reserved. 1-5 Figure 11.2 Function with a Structured Input Parameter

6. 1-6 © 2010 Pearson Addison-Wesley. All rights reserved. 1-6 Figure 11.3 Function Comparing Two Structured Values for Equality

7. 1-7 © 2010 Pearson Addison-Wesley. All rights reserved. 1-7 Figure 11.3 Function Comparing Two Structured Values for Equality (contd)

8. 1-8 © 2010 Pearson Addison-Wesley. All rights reserved. 1-8 Figure 11.4 Function with a Structured Output Argument

9. 1-9 © 2010 Pearson Addison-Wesley. All rights reserved. 1-9 Figure 11.5 Data Areas of main and scan_planet during Execution of status = scan_planet (&current_planet);

10. 1-10 © 2010 Pearson Addison-Wesley. All rights reserved. 1-10 Figure 11.6 Function get_planet Returning a Structured Result Type

11. 1-11 © 2010 Pearson Addison-Wesley. All rights reserved. 1-11 Figure 11.7 Function to Compute an Updated Time Value

12. 1-12 © 2010 Pearson Addison-Wesley. All rights reserved. 1-12 Figure 11.8 Structured Values as a Function Input Argument and as a Function Result

13. 1-13 © 2010 Pearson Addison-Wesley. All rights reserved. 1-13 Figure 11.9 Data Type planet_t and Basic Operations

14. 1-14 © 2010 Pearson Addison-Wesley. All rights reserved. 1-14 Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers

15. 1-15 © 2010 Pearson Addison-Wesley. All rights reserved. 1-15 Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (contd)

16. 1-16 © 2010 Pearson Addison-Wesley. All rights reserved. 1-16 Figure 11.10 Partial Implementatio n of Type and Operators for Complex Numbers (contd)

17. 1-17 © 2010 Pearson Addison-Wesley. All rights reserved. 1-17 Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (contd)

18. 1-18 © 2010 Pearson Addison-Wesley. All rights reserved. 1-18 Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (contd)

19. 1-19 © 2010 Pearson Addison-Wesley. All rights reserved. 1-19 Figure 11.11 An Array of Structures

20. 1-20 © 2010 Pearson Addison-Wesley. All rights reserved. 1-20 Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures

21. 1-21 © 2010 Pearson Addison-Wesley. All rights reserved. 1-21 Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (contd)

22. 1-22 © 2010 Pearson Addison-Wesley. All rights reserved. 1-22 Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (contd)

23. 1-23 © 2010 Pearson Addison-Wesley. All rights reserved. 1-23 Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (contd)

24. 1-24 © 2010 Pearson Addison-Wesley. All rights reserved. 1-24 Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (contd)

25. 1-25 © 2010 Pearson Addison-Wesley. All rights reserved. 1-25 Figure 11.13 Data File and Sample Run of Measurement Conversion Program

26. 1-26 © 2010 Pearson Addison-Wesley. All rights reserved. 1-26 Figure 11.14 Function That Displays a Structure with a Union Type Component

27. 1-27 © 2010 Pearson Addison-Wesley. All rights reserved. 1-27 Figure 11.15 Two Interpretations of Parameter hair

28. 1-28 © 2010 Pearson Addison-Wesley. All rights reserved. 1-28 Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures

29. 1-29 © 2010 Pearson Addison-Wesley. All rights reserved. 1-29 Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (contd)

30. 1-30 © 2010 Pearson Addison-Wesley. All rights reserved. 1-30 Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (contd)

31. 1-31 © 2010 Pearson Addison-Wesley. All rights reserved. 1-31 Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (contd)