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TC Prog Guide
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card_29601.txt
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1991-02-27
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3KB
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114 lines
-- card: 29601 from stack: in
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----- text -----
Example of user-defined data types
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/*
* FILE: personnel.c
* AUTHOR: R.G.
* CREATED: June 20, 1990
*
* C program illustrating scope and use of user-defined data types.
*
* PROJECT CONTENTS:
* personnel.c, ANSI, oops libraries
*/
# include <stdio.h> /* declares standard I/O functions */
# include <string.h> /* declares string handling functions */
/******************************************************************
* Definition of enum day_of_week type (file scope)
******************************************************************/
enum day_of_week
{
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
};
/* synonym for 'enum day_of_week' is simply 'day_of_week': */
typedef enum day_of_week day_of_week;
/******************************************************************
* Definition of struct personnel_rec type (file scope)
******************************************************************/
struct personnel_rec
{
/* declare types of members, without allocating space yet: */
char name[80];
day_of_week days_off[2]; /* member has enum type */
/* legal circular reference using pointer: */
struct personnel_rec *boss;
};
typedef struct personnel_rec personnel_rec;
/******************************************************************
* main() function
******************************************************************/
main()
{
/* allocate two struct variables with block scope: */
personnel_rec employee[2];
/* string copy function from standard libraries: */
strcpy(employee[0].name,"Andrew Lipton");
employee[0].days_off[0] = Saturday;
employee[0].days_off[1] = Sunday;
employee[0].boss = &employee[0]; /* Andy's his own boss! */
strcpy(employee[1].name,"James Nutmeg");
employee[1].days_off[0] = Sunday;
employee[1].days_off[1] = Wednesday;
employee[1].boss = &employee[0];
/* use standard library function printf() for output: */
printf("First employee: %s and his boss: %s\n",
employee[0].name,(employee[0].boss)->name);
printf("Second employee: %s and his boss: %s\n",
employee[1].name,(employee[1].boss)->name);
}
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----- text -----
This is a complete example demonstrating C data types:
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