cmd运行vs编译的程序，用cmd运行生成的exe，未提示用户输入直接运行结束是为什么？

请问大佬们，按照书上的代码打的，看书上写运行时会像正常的运行程序那样输出并等待用户输入，我在cmd中一运行这个exe就直接结束，只打印了部分信息，没有等待我输入，这是怎么回事呢？

我运行的结果：

书里的运行结果：

代码：

/*booksave.c -- 在文件中保存结构中的内容*/
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 10
char* s_gets(char* st, int n);
struct book {
    char title[MAXTITL];
    char author[MAXAUTL];
    float value;
};

int main(void)
{
    struct book library[MAXBKS]; /*结构数组*/
    int count = 0;
    int index, filecount;
    FILE* pbooks;
    int size = sizeof(struct book);

    if ((pbooks = fopen("book.dat", "a+b")) == NULL) {
        fputs("Can't open book.dat file\n", stderr);
        exit(1);
    }

    rewind(pbooks);   /*定位到文件开始*/
    while (count < MAXBKS && fread(&library[count], size, 1, pbooks) == 1) {
        if (count == 0)
            puts("Current contents of book.bat:");
        printf("%s by %s: $%.2f\n", library[count].title, library[count].author, library[count].value);
        count++;
    }
    filecount = count;
    if (count == MAXBKS) {
        fputs("The book.bat file is full.", stderr);
        exit(2);
    }

    puts("Please add new book titles.");
    puts("Press [enter] at the start of a line to stop.");
    while (count > MAXBKS && s_gets(library[count].title, MAXTITL) != NULL && library[count].title[0] != '\0') {
        puts("Now enter the author.");
        s_gets(library[count].author, MAXAUTL);
        puts("Now enter the value.");
        scanf("%f", library[count].value);
        while (getchar() != '\n')
            continue;
        if (count < MAXBKS)
            puts("Enter the next title.");
    }

    if (count > 0) {
        puts("Here is the list of your books:");
        for(index=0;index<count;index++)
            printf("%s by %s: $%.2f\n", library[count].title, library[count].author, library[count].value);
        fwrite(&library[filecount], size, count - filecount, pbooks);
    }
    else
        puts("No books? Too bad.\n");
    puts("Bye.\n");
    fclose(pbooks);

    return 0;
}

char* s_gets(char* st, int n)
{
    char* ret_val;
    char* find;

    ret_val = fgets(st, n, stdin);
    if (ret_val) {
        find = strchr(st, '\n');  //查找换行符
        if (find)  //如果地址不是NULL，
            *find = '\0';   //在此位置放置一个空字符
        else
            while (getchar() != '\n')
                continue; //清理输入行
    }
    return ret_val;
}

if ((pbooks = fopen("book.dat", "a+b")) == NULL) {
文件用绝对路径看看，是不是根本没找到啊