C语言链表的相关问题，可能有些地方忽略掉了。

Question

在vscode上运行出现段错误，不知道为啥，数据录入后输出失败，求帮忙改一下，并说明一下原因，感谢。

#include<stdio.h>
#include<windows.h>
//头插法建立单链表
struct Book
{
    char title[128];
    char author[40];
    struct Book *next;
};
void getInput(struct Book *book)
{
    printf("please input the title:\n");
    scanf("%s",book->title);
    printf("please input the author:\n");
    scanf("%s",book->author);

}
void addBook(struct Book **library)
{
    struct Book *book,*temp;
    book = (struct Book *)malloc(sizeof(struct Book));
    if(book == NULL)
    {
        printf("failed to apply for space");
        exit(1);
    }
    getInput(book);
    if(*library!=NULL)
    {
        temp = *library;
        *library = book;
        book->next = temp;
    }
    else{
        //如果是空的单链表，那么就把library指向新的节点
        *library = book;
        book->next = NULL;

    }
};
void printLibrary(struct Book *library)
{
    struct Book *book;
    int count =1;
    while(book->next !=NULL)
    {
        printf("Book%d",count);
        printf("Book_title:\n",book->title);
        printf("Book_author\n",book->author);
        book = book->next;
        count++;
    }

}
void releaseLibrary(struct Book *library)
{
    while (library!=NULL)
    {
        /* code */
        free(library);
       
    }
    
}
int main()
{
    int ch;
    struct Book *library = NULL;
    
    while(1)
    {
        printf("if you input the message of book?(Y/N)");
        
        do
        {
            /* code */
            ch =getchar();
        } while (ch!='Y'&&ch!='N');
        if(ch=='Y')
        {
            addBook(&library);
        }
        else{
            break;
        }
    }
    printf("If you print the message of book?(Y/N)");
    do
    {
        ch = getchar();

    }while(ch!='Y'&&ch!='N');
    if(ch == 'Y')
    {
        printLibrary(library);
    }
   

    system("pause'");

}

Answer 1

修改如下

#include<stdio.h>
//#include<windows.h>
//头插法建立单链表
struct Book
{
    char title[128];
    char author[40];
    struct Book *next;
};
void getInput(struct Book *book)
{
    printf("please input the title:\n");
    getchar();
    scanf("%s",book->title);
    printf("please input the author:\n");
    getchar();
    scanf("%s",book->author);
}
void addBook(struct Book **library)
{
    struct Book *book,*temp;
    book = (struct Book *)malloc(sizeof(struct Book));
    if(book == NULL)
    {
        printf("failed to apply for space");
        exit(1);
    }
    getInput(book);
    if(*library!=NULL)
    {
        temp = *library;
        *library = book;
        book->next = temp;
    }
    else 
    {
        *library = book;
        book->next = NULL;
    }
}
void printLibrary(struct Book *book)
{
    //struct Book *book=Book *library;
    int count =1;
    while(book !=NULL)
    {
        printf("Book%d",count);
        printf("Book_title:%s\n",book->title);
        printf("Book_author:%s\n",book->author);
        book = book->next;
        count++;
    }
}
void releaseLibrary(struct Book *library)
{
    while (library!=NULL)
    {
        free(library);
    }
}
int main()
{
    int ch;
    struct Book *library = NULL;
    while(1)
    {
        printf("if you input the message of book?(Y/N)");
        do
        {
            ch =getchar();
        }
        while(ch!='Y'&&ch!='N');
        if(ch=='Y')
        {
            addBook(&library);
        }
        else 
        {
            break;
        }
    }
    printf("If you print the message of book?(Y/N)");
    do
    {
        ch = getchar();
    } while(ch!='Y'&&ch!='N');
    if(ch == 'Y')
    {
        printLibrary(library);
    }
    //system("pause'");

}