关于打印的问题仍在#include <stdio.h！

这次是更改过来的了，打印的问题仍在

#include<stdio.h>
#include<stdlib.h>

struct Book
{
    char title[128];
    struct Book *next;
};

void addBook(struct Book **lbr);
void getInput(struct Book *book);
void printlbr(struct Book *lbr);
void release(struct Book **lbr);

void addBook(struct Book **lbr)
{
    struct Book *book,*temp;
    book = (struct Book *)malloc(sizeof(struct Book));
    
    if(book == NULL)
    {
        printf("内存分配失败\n");
        exit(1);
    }
    
    getInput(book);
    
    if(*lbr != NULL)
    {
        temp = *lbr;
        *lbr = book;
        book = temp;
    }
    else
    {
        *lbr = book;
        book->next = NULL;
    }
}

void getInput(struct Book *book)
{
    printf("请输入书名：");
    scanf("%s",book->title);
}

void printlbr(struct Book *lbr)
{
    struct Book *book;
    int count = 1;
    
    book = lbr;
    while(book != NULL)
    {
        printf("Book%d:\n",count);
        printf("书名: %s\n",book->title);
        book = book->next;
        count++;
    }
}

void release(struct Book **lbr)
{
    struct Book *temp;
    
    while(lbr != NULL)
    {
        temp = *lbr;
        *lbr = (*lbr)->next;
        free(temp);
    }
}

int main(void)
{
    struct Book *lbr;
    int ch;
     
    while(1)
    {
        printf("请问是否需要录入书籍信息（Y/N）：");
        do
        {
            ch = getchar();
        }while(ch != 'Y' && ch != 'N');
    
        if(ch == 'Y')
        {
            addBook(&lbr);
        }
        else
        {
            break;
        }
    }
    
    printf("请问是否需要打印书籍信息（Y/N）：");
    do
    {
        ch = getchar();
    }while(ch != 'Y' && ch != 'N');
    
    if(ch == 'Y')
    {
        printlbr(lbr);
    }
    
    release(&lbr);
    
    return 0;
}

没有正确地设置book->next指针。你应该让book->next指向temp，还有getInput函数放在addBook函数之前，不然会报错
运行结果

帮你修改好了，拿去用

#include <stdio.h>
#include <stdlib.h>

struct Book {
  char title[128];
  struct Book *next;
};
// 输入书籍信息
void getInput(struct Book *book) {
  printf("请输入书名:");
  scanf("%s", book->title);
}

// 添加书籍
void addBook(struct Book **lbr) {

  struct Book *book, *temp;

  book = (struct Book *)malloc(sizeof(struct Book));
  if (book == NULL) {
    printf("内存分配失败\n");
    exit(1);
  }

  getInput(book);

  if (*lbr != NULL) {
    temp = *lbr;
    *lbr = book;
    book->next = temp; 
  } else {
    *lbr = book;
    book->next = NULL;
  }

}



// 打印书籍链表
void printlbr(struct Book *lbr) {
  
  struct Book *book;
  int count = 1;

  book = lbr;
  while (book != NULL) {
    printf("Book%d:\n", count);
    printf("书名: %s\n", book->title);
    book = book->next;
    count++;
  }

}

// 释放内存
void release(struct Book **lbr) {

  struct Book *temp;

  while (*lbr != NULL) {
    temp = *lbr;
    *lbr = (*lbr)->next;
    free(temp);
  }

}

int main(void) {

  struct Book *lbr;
  int ch;

  while (1) {

    printf("请问是否需要录入书籍信息(Y/N):");
    do {
      ch = getchar();
    } while (ch != 'Y' && ch != 'N');

    if (ch == 'Y') {
      addBook(&lbr);
    } else {
      break;
    }

  }

  printf("请问是否需要打印书籍信息(Y/N):");
  do {
    ch = getchar(); 
  } while (ch != 'Y' && ch != 'N');

  if (ch == 'Y') {
    printlbr(lbr);
  }

  release(&lbr);

  return 0;

}

if(*lbr != NULL)
{
    temp = *lbr;
    *lbr = book;
    book = temp;
}

->

if(*lbr != NULL)
{
    temp = *lbr;
    *lbr = book;
    book->next = temp;
}

修改如下，改动处见注释，供参考：

#include<stdio.h>
#include<stdlib.h>
struct Book{
    char title[128];
    struct Book* next;
};

void addBook(struct Book** lbr);
void getInput(struct Book* book);
void printlbr(struct Book* lbr);
void release(struct Book** lbr);

void addBook(struct Book** lbr)
{
    struct Book* book, * temp;
    book = (struct Book*)malloc(sizeof(struct Book));
    if (book == NULL)
    {
        printf("内存分配失败\n");
        exit(1);
    }
    book->next = NULL;      // 修改
    getInput(book);

    if ((*lbr) != NULL)
    {
        temp = *lbr;     
        *lbr = book;     
        book->next = temp; // book = temp; 修改 
    }
    else
    {
        *lbr = book;
        //book->next = NULL; 修改
    }
}

void getInput(struct Book* book)
{
    printf("请输入书名：");
    scanf("%s", book->title);
}

void printlbr(struct Book* lbr)
{
    struct Book* book;
    int count = 1;

    book = lbr;
    while (book != NULL)
    {
        printf("Book%d:\n", count);
        printf("书名: %s\n", book->title);
        book = book->next;
        count++;
    }
}

void release(struct Book** lbr)
{
    struct Book* temp;

    while ((*lbr) != NULL) //while (lbr != NULL) 修改
    {
        temp = *lbr;
        *lbr = (*lbr)->next;
        free(temp);
    }
}

int main(void)
{
    struct Book* lbr = NULL;  //struct Book* lbr;  修改
    int ch;

    while (1)
    {
        printf("请问是否需要录入书籍信息（Y/N）：");
        do
        {
            ch = getchar();
        } while (ch != 'Y' && ch != 'N');

        if (ch == 'Y')
        {
            addBook(&lbr);
        }
        else
        {
            break;
        }
    }

    printf("请问是否需要打印书籍信息（Y/N）：");
    do
    {
        ch = getchar();
    } while (ch != 'Y' && ch != 'N');

    if (ch == 'Y')
    {
        printlbr(lbr);
    }

    release(&lbr);

    return 0;
}

有几个问题

1、main函数里面的 struct Book *lbr; 没有初始化

struct Book *lbr = NULL;

2、根据releas函数，目的是要在链表尾部插入，而addBook函数做法错误，因为lbr总是存头部。
可以每次插入时遍历，或者用static变量保存链表尾部

void addBook(struct Book **lbr)
{
    struct Book *book,*temp;
    static struct Book *tail = NULL;
    book = (struct Book *)malloc(sizeof(struct Book));
    
    if(book == NULL)
    {
        printf("内存分配失败\n");
        exit(1);
    }
    
    getInput(book);
    
    if(*lbr != NULL)
    {
        tail->next = book;
        book->next = NULL;
        tail = book;
    }
    else
    {
        *lbr = tail = book;
        book->next = NULL;
    }
}

3、release 函数有误

while(lbr != NULL)
要改成
while(*lbr != NULL)

【相关推荐】

• 你可以看下这个问题的回答https://ask.csdn.net/questions/196883
• 这篇博客你也可以参考下：标准函数库（#include）
• 除此之外, 这篇博客: 一个简单的C语言程序中的 #include <stdio.h> 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

  包含标准输入输出头文件(standard input output.head)，包含printf函数

如果你已经解决了该问题, 非常希望你能够分享一下解决方案, 写成博客, 将相关链接放在评论区, 以帮助更多的人 ^-^