20131106【C言語】構造体を構造体でネストする
お題
構造体を構造体でネストする
プログラム概要
簡易図書管理データベース
ソース
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define MAX 100
int menu(void);
void display(int i);
void author_search(void);
void title_search(void);
void enter(void);
void save(void);
void load(void);
struct book_type {
unsigned date; /* Public date */
unsigned char ed; /* Edition */
unsigned pages; /* Page count */
};
struct catalog {
char name[80]; /* Author */
char title[80]; /* Book name */
char pub[80]; /* Publisher */
struct book_type book; /* Data */
} cat[MAX];
int top = 0; /* Final pointer */
int main(void)
{
int choice;
do {
choice = menu();
switch (choice) {
case 1:
enter(); /* Enter book name */
break;
case 2:
author_search(); /* Search by author */
break;
case 3:
title_search(); /* Search by book name */
break;
case 4:
save();
break;
case 5:
load();
}
} while (choice != 6);
return 0;
}
/* Return menu item */
menu(void)
{
int i;
char str[80];
printf("Book catalog:\n");
printf(" 1. Enter\n");
printf(" 2. Search by author\n");
printf(" 3. Search by book name\n");
printf(" 4. Save catalog\n");
printf(" 5. Load catalog\n");
printf(" 6. Exit\n");
do {
printf("Please enter item: ");
gets(str);
i = atoi(str);
printf("\n");
} while*1;
return i;
}
/* Enter book name to data base */
void enter(void)
{
int i;
char temp[80];
for (i = top; i < MAX; i++) {
printf("Please enter author(Please input enter to exit) : ");
gets(cat[i].name);
if(!*cat[i].name)
break;
printf("Please input book name: ");
gets(cat[i].title);
printf("Please input publisher: ");
gets(cat[i].pub);
printf("Please input publish date: ");
gets(temp);
cat[i].book.date = (unsigned)atoi(temp);
printf("Please input edition: ");
gets(temp);
cat[i].book.ed = (unsigned char)atoi(temp);
printf("Please input page count: ");
gets(temp);
cat[i].book.pages = (unsigned)atoi(temp);
}
top = i;
}
/* Search by author */
void author_search(void)
{
char name[80];
int i, found;
printf("Author: ");
gets(name);
found = 0;
for (i = 0; i < top; i++)
if (!strcmp(name, cat[i].name)) {
display(i);
found = 1;
printf("\n");
}
if (!found)
printf("Could not be found.\n");
}
/* Search by book name */
void title_search(void)
{
char title[80];
int i, found;
printf("Book name: ");
gets(title);
found = 0;
for (i = 0; i < top; i++)
if (!strcmp(title, cat[i].title)) {
display(i);
found = 1;
printf("\n");
}
if (!found)
printf("Could not be found.\n");
}
/* Display catalog */
void display(int i)
{
printf("%s\n", cat[i].title);
printf("Author: %s\n", cat[i].name);
printf("Publisher: %s\n", cat[i].pub);
printf("Copy right: %u, Edition: %u\n",
cat[i].book.date, cat[i].book.ed);
printf("Page count: %u\n", cat[i].book.pages);
}
/* Load catalog */
void load(void)
{
FILE *fp;
if *2 == NULL) {
printf("Could not find catalog.\n");
return;
}
if (fread(&top, sizeof top, 1, fp) != 1) { /* Read count */
printf("Count read error.\n");
exit(1);
}
if (fread(cat, sizeof cat, 1, fp) != 1) { /* Read data */
printf("Catalog read error.\n");
exit(1);
}
fclose(fp);
}
/* Save catalog file */
void save(void)
{
FILE *fp;
if *3 == NULL) {
printf("Cannot open file.\n");
exit(1);
}
if (fwrite(&top, sizeof top, 1, fp) != 1) { /* Write count */
printf("Count write error.\n");
exit(1);
}
if (fwrite(cat, sizeof cat, 1, fp) != 1) { /* Write data */
printf("Catalog write error.\n");
exit(1);
}
fclose(fp);
}
実行結果
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 1
Please enter author(Please input enter to exit) : author1
Please input book name: book1
Please input publisher: hoge1
Please input publish date: 20130101
Please input edition: 1
Please input page count: 100
Please enter author(Please input enter to exit) : author2
Please input book name: book2
Please input publisher: hoge2
Please input publish date: 20140101
Please input edition: 2
Please input page count: 200
Please enter author(Please input enter to exit) :
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 4
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 5
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 2
Author: author1
book1
Author: author1
Publisher: hoge1
Copy right: 20130101, Edition: 1
Page count: 100
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 3
Book name: book1
book1
Author: author1
Publisher: hoge1
Copy right: 20130101, Edition: 1
Page count: 100
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 3
Book name: book2
book2
Author: author2
Publisher: hoge2
Copy right: 20140101, Edition: 2
Page count: 200
Book catalog:
1. Enter
2. Search by author
3. Search by book name
4. Save catalog
5. Load catalog
6. Exit
Please enter item: 6
