© 2010 pearson addison-wesley. all rights reserved. addison wesley is an imprint of chapter 11:...
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© 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
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Structures and Union Types
A database is a collection of information stored in a computer’s 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 object’s data type.
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Structures and Union TypesDefine a structure type before it can be created or saved. #define STRSZ 10typedef 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};
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Figure 11.1 Assigning Values to Components of Variable current_planet p569
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Figure 11.2 Function with a Structured Input Parameter
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Figure 11.3 Function Comparing Two Structured Values for Equality
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Figure 11.3 Function Comparing Two Structured Values for Equality (cont’d)
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Figure 11.4 Function with a Structured Output Argument
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Figure 11.5 Data Areas of main and scan_planet during Execution of status = scan_planet (¤t_planet);
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Figure 11.6 Function get_planet Returning a Structured Result Type
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Figure 11.7 Function to Compute an Updated Time Value
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Figure 11.8 Structured Values as a Function Input Argument and as a Function Result
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Figure 11.9 Data Type planet_t and Basic Operations
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Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers
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Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (cont’d)
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Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (cont’d)
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Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (cont’d)
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Figure 11.10 Partial Implementation of Type and Operators for Complex Numbers (cont’d)
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Figure 11.11 An Array of Structures
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Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures
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Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (cont’d)
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Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (cont’d)
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Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (cont’d)
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Figure 11.12 Universal Measurement Conversion Program Using an Array of Structures (cont’d)
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Figure 11.13 Data File and Sample Run of Measurement Conversion Program
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Figure 11.14 Function That Displays a Structure with a Union Type Component
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Figure 11.15 Two Interpretations of Parameter hair
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Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures
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Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (cont’d)
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Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (cont’d)
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Figure 11.16 Program to Compute Area and Perimeter of Geometric Figures (cont’d)