任何人可以帮助我的图书馆目录C程序？ [英] Can anyone help me with my library catalog C program?
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问题描述
我需要使用BST和文件处理，但是由于displayCatalog功能似乎不起作用，所以我被困住了。
I need to use BST and file handling but I'm stuck with this one because the displayCatalog function doesn't seem to work.
我想建立结构化之前，我打印到文件。我该怎么做？
I want to establish the struct first before I print it to the file. How do I go about this?
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#include<Windows.h>
typedef struct book catalog;
FILE *fx,*fy;
struct book{
char title[20];
char author[20];
int isbn[15];
char genre[10];
char publisher[20];
int year[5];
char synopsis[100];
catalog *left;
catalog *right;
};
catalog *root;
void addBooks();
void removeBooks(); //
void modify(); //
void searchBook(); //
void perTitle(); //
void perAuthor(); //
void perISBN(); //
void perGenre(); //
void displayCatalog(catalog *root); //
int ifexists(char *x);
void insert(catalog *root,catalog *x);
catalog remove(catalog *root,catalog *x);
void menu();
void gotoxy(int x,int y);
void main(){
root=NULL;
menu();
}
void menu(){
int choice;
system("cls");
gotoxy(22,5);
printf("----------WELCOME TO THE CARD CATALOG----------");
gotoxy(22,7);
printf("1] Add a book");
gotoxy(22,8);
printf("2] Remove a book");
gotoxy(22,9);
printf("3] Modify a book");
gotoxy(22,10);
printf("4] Search a book");
gotoxy(22,11);
printf("5] Display the catalog");
gotoxy(22,12);
printf("6] Exit");
gotoxy(22,14);
printf("Enter your choice: ");
scanf("%d",&choice);
switch(choice){
case 1: addBooks();
break;
case 2: removeBooks();
break;
case 3: modify();
break;
case 4: searchBook();
break;
case 5: displayCatalog(root);
break;
case 6: exit(0);
}
}
void addBooks(){
char y;
catalog *ptr;
ptr=(catalog*)malloc(sizeof(catalog));
system("cls");
gotoxy(22,8);
printf("Title: ");
scanf("%s",ptr->title);
gotoxy(22,9);
printf("Author: ");
scanf("%s",ptr->author);
gotoxy(22,10);
printf("Genre: ");
scanf("%s",ptr->genre);
gotoxy(22,11);
printf("ISBN: ");
scanf("%s",ptr->isbn);
gotoxy(22,12);
printf("Publisher: ");
scanf("%s",ptr->publisher);
gotoxy(22,13);
printf("Year: ");
scanf("%s",ptr->year);
gotoxy(22,14);
printf("Synopsis: ");
scanf("%s",ptr->synopsis);fflush(stdin);
ptr->left=NULL;
ptr->right=NULL;
if(root==NULL){
root=ptr;
} else {
insert(root,ptr);
}
menu();
}
void insert(catalog *root,catalog *x){
if(x->isbn < root->isbn){
if(root->left==NULL){
root->left=x;
} else {
insert(root->left,x);
}
}
if(x->isbn > root->isbn){
if(root->right==NULL){
root->right=x;
} else {
insert(root->right,x);
}
}
}
void removeBooks(){
catalog *ptr,*temp;
int x;
char title[20],y;
system("cls");
if(root==NULL){
gotoxy(22,10);
printf("No records to show...");
getch();
menu();
}
gotoxy(22,10);
printf("Enter title of book to delete: ");
scanf("%s",title);
ptr=root;
while(ptr!=NULL){
if(strcmp(ptr->title,title)==0){
gotoxy(22,11);
printf("The book is in the catalog.");
gotoxy(22,12);
printf("Title: %s",root->title);
gotoxy(22,13);
printf("Author: %s",root->author);
} else {
gotoxy(22,11);
printf("No book with that title in the catalog.");
getch();
menu();
}
if(strcmp(ptr->title,title)==0){
gotoxy(22,14);
printf("Remove book record? (y/n) ");
if(getch()=='y'){
remove(root,ptr);
menu();
} else {
menu();
}
}
}
}
catalog remove(catalog *root,catalog *x){
catalog *temp;
char y;
if(x==root){
temp=root;
free(temp);
root=NULL;
} else if(x->isbn < root->isbn){
*root->left=remove(root->left,x);
} else if(x->isbn > root->isbn){
*root->right=remove(root->right,x);
} else if(root==NULL){
gotoxy(22,10);
printf("Nothing to remove...");
getch();
menu();
}
printf("The book has been removed.");
printf("Remove another book? (y/n) ");
scanf("%c",&y);
return *x;
}
void modify(){
catalog *ptr;
int num;
char title[20];
system("cls");
if(root==NULL){
printf("No records exist...");
getch();
menu();
}
printf("Enter title of book to be modified: ");
scanf("%s",title);
ptr=root;
while(ptr!=NULL){
if(strcmp(ptr->title,title)==0){
printf("Input new information.");
printf("Title: ");
scanf("%s",root->title);
printf("Author: ");
scanf("%s",root->author);
printf("ISBN: ");
scanf("%d",root->isbn);
printf("Publisher: ");
scanf("%s",root->publisher);
printf("Year: ");
scanf("%d",root->year);
printf("Synopsis: ");
scanf("%s",root->synopsis);
printf("The book's information has been modified.");
} else {
printf("No book found.");
break;
}
}
getch();
menu();
}
void searchBook(){
int choice;
char title[20], author[20];
int num;
system("cls");
if(root==NULL){
printf("No records to show...");
getch();
menu();
}
gotoxy(22,10);
printf("-----SEARCH A BOOK-----");
gotoxy(22,12);
printf("1] By title");
gotoxy(22,13);
printf("2] By author");
gotoxy(22,14);
printf("3] By ISBN");
gotoxy(22,15);
printf("4] Back to menu");
gotoxy(22,18);
printf("Enter your choice: ");
scanf("%d",&choice);
switch(choice){
case 1: perTitle();
break;
case 2: perAuthor();
break;
case 3: perISBN();
break;
case 4: perGenre();
break;
case 5: menu();
}
}
void perTitle(){
catalog *ptr;
char title[20],ans;
system("cls");
gotoxy(22,15);
printf("Enter book title: ");
scanf("%s",title);
ptr=root;
while(strcmp(ptr->title,title)!=0){
ptr=ptr->left;
if(ptr==NULL)
menu();
}
system("cls");
if(ptr!=NULL){
gotoxy(22,10);
printf("That book is in the catalog.");
gotoxy(22,11);
printf("Title: %s",ptr->title);
gotoxy(22,12);
printf("Author: %s",ptr->author);
gotoxy(22,13);
printf("ISBN: %d",ptr->isbn);
gotoxy(22,14);
printf("Genre: %s",ptr->genre);
gotoxy(22,15);
printf("Publisher: %s",ptr->publisher);
gotoxy(22,16);
printf("Year: %d",ptr->year);
gotoxy(22,17);
printf("Synopsis: %s",ptr->synopsis);
} else {
gotoxy(22,10);
printf("No records to show...");
}
printf("Try another? (y/n) ");
scanf("%c",&ans);
switch(ans){
case 'y': searchBook();
break;
case 'n': menu();
}
}
void perAuthor(){
catalog *ptr;
char author[20],ans;
system("cls");
gotoxy(22,15);
printf("Enter book title: ");
scanf("%s",author);
ptr=root;
while(strcmp(ptr->author,author)!=0){
ptr=ptr->left;
if(ptr==NULL)
menu();
}
system("cls");
if(ptr!=NULL){
gotoxy(22,10);
printf("That book is in the catalog.");
gotoxy(22,11);
printf("Title: %s",ptr->title);
gotoxy(22,12);
printf("Author: %s",ptr->author);
gotoxy(22,13);
printf("ISBN: %d",ptr->isbn);
gotoxy(22,14);
printf("Genre: %s",ptr->genre);
gotoxy(22,15);
printf("Publisher: %s",ptr->publisher);
gotoxy(22,16);
printf("Year: %d",ptr->year);
gotoxy(22,17);
printf("Synopsis: %s",ptr->synopsis);
} else {
gotoxy(22,10);
printf("No records to show...");
}
printf("Try another? (y/n) ");
scanf("%c",&ans);
switch(ans){
case 'y': searchBook();
break;
case 'n': menu();
}
}
void perISBN(){
catalog *ptr;
int isbn[20];
char ans;
system("cls");
gotoxy(22,15);
printf("Enter book ISBN: ");
scanf("%s",isbn);
ptr=root;
while(ptr->isbn==isbn){
ptr=ptr->left;
if(ptr==NULL)
menu();
}
system("cls");
if(ptr!=NULL){
gotoxy(22,10);
printf("That book is in the catalog.");
gotoxy(22,11);
printf("Title: %s",ptr->title);
gotoxy(22,12);
printf("Author: %s",ptr->author);
gotoxy(22,13);
printf("ISBN: %d",ptr->isbn);
gotoxy(22,14);
printf("Genre: %s",ptr->genre);
gotoxy(22,15);
printf("Publisher: %s",ptr->publisher);
gotoxy(22,16);
printf("Year: %d",ptr->year);
gotoxy(22,17);
printf("Synopsis: %s",ptr->synopsis);
} else {
gotoxy(22,10);
printf("No records to show...");
}
printf("Try another? (y/n) ");
scanf("%c",&ans);
switch(ans){
case 'y': searchBook();
break;
case 'n': menu();
}
}
void perGenre(){
catalog *ptr;
char genre[20],ans;
system("cls");
gotoxy(22,15);
printf("Enter book title: ");
scanf("%s",genre);
ptr=root;
while(strcmp(ptr->genre,genre)!=0){
ptr=ptr->left;
if(ptr==NULL)
menu();
}
system("cls");
if(ptr!=NULL){
gotoxy(22,10);
printf("That book is in the catalog.");
gotoxy(22,11);
printf("Title: %s",ptr->title);
gotoxy(22,12);
printf("Author: %s",ptr->author);
gotoxy(22,13);
printf("ISBN: %d",ptr->isbn);
gotoxy(22,14);
printf("Genre: %s",ptr->genre);
gotoxy(22,15);
printf("Publisher: %s",ptr->publisher);
gotoxy(22,16);
printf("Year: %d",ptr->year);
gotoxy(22,17);
printf("Synopsis: %s",ptr->synopsis);
} else {
gotoxy(22,10);
printf("No records to show...");
}
printf("Try another? (y/n) ");
scanf("%c",&ans);
switch(ans){
case 'y': searchBook();
break;
case 'n': menu();
}
}
void displayCatalog(catalog *root){
catalog *ptr;
system("cls");
ptr=root;
while(ptr!=NULL){
displayCatalog(root->left);
printf("Title: %s",ptr->title);
printf("Author: %s",ptr->author);
printf("ISBN: %d",ptr->isbn);
printf("Genre: %s",ptr->genre);
printf("Publisher: %s",ptr->publisher);
printf("Year: %d",ptr->year);
printf("Synopsis: %d",ptr->synopsis);
displayCatalog(root->right);
}
menu();
}
void gotoxy(int x,int y){
COORD coord;
coord.X=x;
coord.Y=y;
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}
更新：所以我编辑了一个我的代码的BIT，以便它已经可以显示。但是，由于perTitle，perAuthor和perGenre函数不起作用，因此将用户输入的字符串和字符串与我的结构进行比较似乎有问题。 perISBN的工作完全正常。
UPDATE: So I edited A BIT of my code so that it can already display. However, there seems to be a problem with comparing the user input's string and the string from my struct because the perTitle, perAuthor, and perGenre functions won't work. The perISBN works perfectly fine.
以下是perTitle（）现在的样子：
Here is how the perTitle() looks now:
void perTitle(){
catalog *ptr;
char title[20],ans;
system("cls");
gotoxy(22,15);
printf("Enter book title: ");
scanf("%s",title);fflush(stdin);
ptr=root;
while(strcmp(ptr->title,title)!=0){
system("cls");
if(ptr!=NULL){
gotoxy(22,10);
printf("That book is in the catalog.");
gotoxy(22,11);
printf("Title: %s",ptr->title);
gotoxy(22,12);
printf("Author: %s",ptr->author);
gotoxy(22,13);
printf("ISBN: %d",ptr->isbn);
gotoxy(22,14);
printf("Genre: %s",ptr->genre);
gotoxy(22,15);
printf("Publisher: %s",ptr->publisher);
gotoxy(22,16);
printf("Year: %d",ptr->year);
gotoxy(22,17);
printf("Synopsis: %s",ptr->synopsis);
} else {
gotoxy(22,10);
printf("No records to show...");
}
}
printf("Try another? (y/n) ");
scanf("%c",&ans);
switch(ans){
case 'y': searchBook();
break;
case 'n': menu();
}
}
鉴于我已将书籍记录添加到列表中，它总是显示尝试另一个（y / n）？
Given that I have added a book record into the list, it always displays "Try another (y/n)?"
推荐答案
代码中有很多错误（这让我甚至想知道它编译）和编译器应该已经发出了很多警告，如果你愿意的话。
There are a lot of things wrong in the code (it makes me even wonder that it compiles at all) and your compiler should have uttered a lot of warnings if you would have let it.
我认为主要的罪魁祸首是在结构体中，特别是在 int 零件。 int isbn [15] 保留一个数组为15 int s，这不是你想要的。任何ISBN需要多于一个 int （假设每个 int 为4个字节，每个字节为8位），因此使用一个字符串一开始只需将 int 更改为 char 。另外： int year [5] 将为五个 int 创建一个数组，但我确定一个更多（再次：假设每个 int 为4个字节，每个字节为8位）。所以你的结构现在是
I think the main culprit is in the struct, especially in the int parts. int isbn[15] reserves an array of 15 ints and that is not what you want. Any ISBN needs more than one int (assuming 4 bytes per int and 8 bit per byte) so use a string for a start. Just change int to char. Also: int year[5] will make an array for five ints but I'm pretty sure one is more than sufficient (again: assuming 4 bytes per int and 8 bit per byte). So your struct is now
struct book{
char title[20];
char author[20];
char isbn[14]; // 13 digits max. plus NUL
char genre[10];
char publisher[20];
int year;
char synopsis[100];
catalog *left;
catalog *right;
};
注意：应直接放置 typedef 在结构下
NB: the typedef should be placed directly under the struct
您还需要更改年份的方式：
You also need to change the way you put the year in:
scanf("%d",&ptr->year);
而在insert函数中的比较需要能够比较字符串，所以
And the comparing in the insert function needs to be able to compare strings now, so
void insert(catalog *root,catalog *x){
if(strcmp(x->isbn, root->isbn) < 0){
if(root->left==NULL){
root->left=x;
} else {
insert(root->left,x);
}
}
if( strcmp(x->isbn, root->isbn) > 0){
if(root->right==NULL){
root->right=x;
} else {
insert(root->right,x);
}
}
}
我无法测试它没有更大的重写（我没有Windows与编译器），所以请注意打字错误。而且您的代码中还有更多的错误，所以它可能仍然无法正常工作，尽管有不同的原因。
I'm not able to test it without a larger rewrite (I don't have Windows with a compiler) so beware of typos. And there are many more errors in your code so it may still not work, although with different reasons that time.
树遍历有点混乱了
void displayCatalog(catalog *root123){
catalog *ptr;
system("cls");
ptr=root123;
while(ptr!=NULL){
if(root123->left != NULL){
displayCatalog(root123->left);
}
printf("Title: %s\n",ptr->title);
printf("Author: %s\n",ptr->author);
printf("ISBN: %s\n",ptr->isbn);
printf("Genre: %s\n",ptr->genre);
printf("Publisher: %s\n",ptr->publisher);
printf("Year: %d\n",ptr->year);
printf("Synopsis: %s\n",ptr->synopsis);
if(root123->right != NULL){
displayCatalog(root123->right);
}
break;
}
menu();
}
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