C语言实战三：图书管理系统

这个图书管理系统包括了添加、查找、删除、编辑、显示和保存书籍信息的功能。书籍信息被保存在一个文本文件中，在程序启动时从文件中加载，退出程序时保存到文件中。用户可以通过命令行界面操作图书管理系统，并进行相应的功能操作。

一、代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>#define MAX_BOOKS 100struct Book {char title[100];char author[100];int year;
};struct Library {struct Book books[MAX_BOOKS];int count;
};// 函数声明
void addBook(struct Library *library);
void searchBook(struct Library library);
void deleteBook(struct Library *library, char *title);
void editBook(struct Library *library, char *title);
void saveBooks(struct Library library, char *filename);
void loadBooks(struct Library *library, char *filename);
void displayBooks(struct Library library);int main() {struct Library library;library.count = 0;loadBooks(&library, "books.txt"); // 从文件加载书籍信息int choice;do {printf("\nLibrary Management System\n");printf("1. Add Book\n");printf("2. Search Book\n");printf("3. Delete Book\n");printf("4. Edit Book\n");printf("5. Display All Books\n");printf("6. Save Books\n");printf("7. Exit\n");printf("Enter your choice: ");scanf("%d", &choice);switch(choice) {case 1:addBook(&library); // 添加书籍break;case 2:searchBook(library); // 查找书籍break;case 3: {char title[100];printf("Enter title of book to delete: ");scanf("%s", title);deleteBook(&library, title); // 删除书籍break;}case 4: {char title[100];printf("Enter title of book to edit: ");scanf("%s", title);editBook(&library, title); // 编辑书籍信息break;}case 5:displayBooks(library); // 显示所有书籍break;case 6:saveBooks(library, "books.txt"); // 保存书籍信息到文件break;case 7:printf("Exiting program.\n");break;default:printf("Invalid choice! Please enter a number from 1 to 7.\n");}} while (choice != 7);return 0;
}// 添加书籍
void addBook(struct Library *library) {if (library->count >= MAX_BOOKS) {printf("Library is full. Cannot add more books.\n");return;}struct Book newBook;printf("Enter title of book: ");scanf("%s", newBook.title);printf("Enter author of book: ");scanf("%s", newBook.author);printf("Enter year of publication: ");scanf("%d", &newBook.year);library->books[library->count] = newBook;library->count++;printf("Book added successfully.\n");
}// 查找书籍
void searchBook(struct Library library) {char title[100];printf("Enter title of book to search: ");scanf("%s", title);int found = 0;for (int i = 0; i < library.count; i++) {if (strcmp(library.books[i].title, title) == 0) {printf("Book found:\n");printf("Title: %s\n", library.books[i].title);printf("Author: %s\n", library.books[i].author);printf("Year: %d\n", library.books[i].year);found = 1;break;}}if (!found) {printf("Book not found.\n");}
}// 删除书籍
void deleteBook(struct Library *library, char *title) {int found = 0;for (int i = 0; i < library->count; i++) {if (strcmp(library->books[i].title, title) == 0) {for (int j = i; j < library->count - 1; j++) {library->books[j] = library->books[j + 1];}library->count--;found = 1;printf("Book deleted successfully.\n");break;}}if (!found) {printf("Book not found.\n");}
}// 编辑书籍信息
void editBook(struct Library *library, char *title) {int found = 0;for (int i = 0; i < library->count; i++) {if (strcmp(library->books[i].title, title) == 0) {printf("Enter new title of book: ");scanf("%s", library->books[i].title);printf("Enter new author of book: ");scanf("%s", library->books[i].author);printf("Enter new year of publication: ");scanf("%d", &library->books[i].year);found = 1;printf("Book edited successfully.\n");break;}}if (!found) {printf("Book not found.\n");}
}// 保存书籍信息到文件
void saveBooks(struct Library library, char *filename) {FILE *file = fopen(filename, "w");if (file == NULL) {printf("Error opening file.\n");return;}for (int i = 0; i < library.count; i++) {fprintf(file, "%s %s %d\n", library.books[i].title, library.books[i].author, library.books[i].year);}fclose(file);printf("Books saved to file successfully.\n");
}// 从文件加载书籍信息
void loadBooks(struct Library *library, char *filename) {FILE *file = fopen(filename, "r");if (file == NULL) {printf("Error opening file.\n");return;}while (!feof(file) && library->count < MAX_BOOKS) {fscanf(file, "%s %s %d\n", library->books[library->count].title, library->books[library->count].author, &library->books[library->count].year);library->count++;}fclose(file);
}// 显示所有书籍
void displayBooks(struct Library library) {printf("Books in library:\n");for (int i = 0; i < library.count; i++) {printf("Title: %s, Author: %s, Year: %d\n", library.books[i].title, library.books[i].author, library.books[i].year);}
}