Using a structure representing a person's name
/*
Beginning C, Third Edition
By Ivor Horton
ISBN: 1-59059-253-0
Published: Apr 2004
Publisher: apress
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define FIRST_NAME_LEN 31
#define SECOND_NAME_LEN 51
#define NUMBER_LEN 16
#define MAX_NUMBERS 50
#define TRUE 1
#define FALSE 0
/* Structure defining a name */
struct Name
{
char firstname[FIRST_NAME_LEN];
char secondname[SECOND_NAME_LEN];
};
/* Structure defining a phone record */
struct PhoneRecord
{
struct Name name;
char number[NUMBER_LEN];
};
struct Name read_name(); /* Read a name from the keyboard */
void show(struct PhoneRecord record); /* Output a phone record */
int has_name(struct PhoneRecord record, struct Name name); /* Test for a name */
void main()
{
char answer = 'n';
struct PhoneRecord records[MAX_NUMBERS]; /* Array of phone records */
struct Name aName; /* Stores a name */
int count = 0; /* Number of phone records */
int found = FALSE; /* Records when a name has been found */
int i = 0; /* Loop control variable */
/* Read an arbitrary number of phone records from the keyboard */
do
{
records[count].name = read_name(); /* Read the name */
printf("Enter the number for this name: ");
scanf(" %[ 0123456789]",records[count++].number); /* Read the number - including spaces */
printf("Do you want to enter another(y or n)?: ");
scanf(" %c", &answer);
}while(count<=MAX_NUMBERS && tolower(answer) == 'y');
/* Search the array of phone records for a number */
do
{
printf("Enter a name for which you want the number.");
aName =read_name();
for(i = 0 ; i<count ; i++)
{
if(has_name(records[i], aName)) /* Test for the name */
{
if(!found) /* If this is the first time */
{
found = TRUE; /* Reset found flag */
printf("The numbers for this name are:\n"); /* and output the heading */
}
printf("%s\n", records[i].number); /* Output the number for the name */
}
}
if(found) /* If the name was found */
found = FALSE; /* Reset the found flag */
else /* Otherwise output message */
printf("No numbers found for this name.\n");
printf("Do you want to search for another (y or n)? ");
scanf(" %c" , &answer);
}while(tolower(answer) == 'y');
for(i = 0 ; i<count ; i++)
show(records[i]);
printf("\n");
}
/* Function to read a name and store it in a Name structure */
struct Name read_name()
{
struct Name name;
printf("Enter a first name: ");
scanf(" %s", &name.firstname);
printf("Enter a second name: ");
scanf(" %s", &name.secondname);
return name;
}
/* Function to output a record */
void show(struct PhoneRecord record)
{
printf("\n%s %s %s", record.name.firstname,record.name.secondname, record.number);
}
/* Function to test whether the name is the same as in a record */
int has_name(struct PhoneRecord record, struct Name name)
{
return (strcmp(name.firstname, record.name.firstname)==0 && strcmp(name.secondname, record.name.secondname)==0);
}