c - 它只显示一个酒店预订

Question

我正在预订酒店，所以我尝试使用用户输入的 iD 来显示预订，但我无法得到它，程序只是卡住而没有错误，或者我尝试了很多东西并在网上查找的任何东西找不到答案。我试着在 if 循环中做了一段时间它也没有工作无法弄清楚问题出在哪里。谢谢。

void display(char *a)
{
    FILE *fp;
    rec = count;
    int choice;
    fp = fopen(a ,"r");
    struct  hotelStruct *temp = (struct hotelStruct *)malloc(sizeof(struct hotelStruct));
    temp->first_name = (char *)malloc(10* sizeof(char));
    temp->last_name = (char *)malloc(15*sizeof(char));
    temp->passport = (char *)malloc(15*sizeof(char));
    temp->nationality = (char *)malloc(30*sizeof(char));
    temp->room = (char *)malloc(10*sizeof(char));
    temp->email = (char *)malloc(30*sizeof(char));
    if (fp == NULL)
        printf("Error!!");
    printf("\nEnter your Reservations iD:\n");
    scanf("%d", &choice);
    fseek(fp, 0, 0);

    while (rec)
    {


        if (choice == temp->id) {
            fread(&temp->id, sizeof(int), 1, fp);
            printf("\niD: %d\n", temp->id);

            fread(temp->first_name, 10, 1, fp);
            printf("First Name: %s\n", temp->first_name);

            fread(temp->last_name, 15, 1, fp);
            printf("Last name: %s\n", temp->last_name);

            fread(temp->passport, 15, 1, fp);
            printf("Passport: %s\n", temp->passport);

            fread(temp->nationality, 30, 1, fp);
            printf("Nationality: %s\n", temp->nationality);

            fread(temp->room, 10, 1, fp);
            printf("Room: %s\n", temp->room);

            fread(&temp->bed, sizeof(int), 1, fp);
            printf("Beds: %d\n", temp->bed);

            fread(temp->email, 30, 1, fp);
            printf("Email: %s\n", temp->email);

            fread(&temp->phone_number, sizeof(int), 1, fp);
            printf("Phone number: %d\n\n\n", temp->phone_number);
        }
        rec--;
    }
    fclose(fp);
    free(temp);
    free(temp->first_name);
    free(temp->last_name);
    free(temp->passport);
    free(temp->room);
    free(temp->email);
    free(temp->nationality);
}

Answer 1

您的计数和记录未定义，因为它们未初始化。

在比较之前先读取 Id。

 fread(&temp->id, sizeof(int), 1, fp); 
  printf("\niD: %d\n", temp->id);
  if (choice == temp->id) {

}