C语言酒店管理系统账单计算函数始终按200元房价计算问题求助

1. 核心逻辑错误：条件判断误用赋值运算符 #

你在getBill()函数的所有if判断中，都使用了赋值运算符=而非相等判断运算符==：

// 错误写法：属于赋值操作，返回值永远为真，所以每次都会优先进入第一个判断分支
if(t = 1)

赋值操作的结果是被赋予的值，因此t=1的结果永远是1（真值），导致程序每次都直接按200美元的标准间计算，不会走到后面的房型判断分支。

2. 结构体定义类型不匹配错误 #

你定义的struct Customer中room_type被声明为int*指针类型，但实际使用中你直接把输入的整型房型编号存到了这个指针变量里，属于类型不匹配的错误，会带来不可预期的运行异常：

// 原错误定义
struct Customer
{
    // 其他字段省略
    int *room_type; // 此处不该定义为指针类型
};

将其改为普通int类型即可正常存储房型编号。

修正后可正常运行的完整代码 #

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#include<conio.h>

// 客户身份结构体
struct Identity
{
    char name_first[50];
    char name_last[50];
    int phone;
    int IC[10];
    char email[50];
    int age;
};
// 日期结构体
struct Date
{
    int day;
    int month;
    int year;
};
// 客户全信息结构体
struct Customer
{
    struct Identity iden;
    int room_number;
    int room_type; // 修正：将指针改为普通int类型存储房型编号
    int bill;
    struct Date check_in;
    struct Date check_out;
    int day_num;
    int cleaning;
};

const int monthDays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
// 计算闰年数量
int countLeapYear(struct Date d)
{
    int years = d.year;
    if(d.month <= 2)
    {
        years--;
    }
    return years / 4 - years / 100 + years / 400;
}

// 计算入住总天数
int getDays(struct Date d1, struct Date d2)
{
    long int n1 = d1.year * 365 + d1.day;
    for(int i = 0; i < d1.month - 1; i++)
    {
        n1 += monthDays[i];
    }
    n1 += countLeapYear(d1);

    long int n2 = d2.year * 365 + d2.day;
    for(int i = 0; i < d2.month - 1; i++)
    {
        n2 += monthDays[i];
    }
    n2 += countLeapYear(d2);
    return (n2 - n1);
}

// 计算账单金额：修正所有if判断的赋值运算符为相等判断运算符
int getBill(int days, int type, int num_of_room)
{
    int t = type;
    if(t == 1)
    {
        printf("\n200\n");
        return 200 * days * num_of_room;
    }
    else if(t == 2)
    {
        printf("500\n");
        return 500 * days * num_of_room;
    }
    else if(t == 3)
    {
        printf("1200\n");
        return 1200 * days * num_of_room;
    }
    else 
    {
        return 0;
    }
}

int main()
{
    int n = 0;
    printf("Input number of customers:\n");
    scanf("%d", &n);
    struct Customer cust[n];
    int num_of_room = 0;
    printf("\n***Please choose your room type***\n");
    printf("How many room do you want?\n");
    scanf("%d", &num_of_room);
    printf("Which type of room do you want?\n");
    printf("1.Standard Room ($200/night)\n");
    printf("2.Deluxe Room ($500/night)\n");
    printf("3.Ocean view room ($1200/night)\n");
    printf("Input the type of room number (1,2,3):\n");
    scanf("%d", &cust->room_type);
    int type = cust->room_type;
    printf("***Please Confirm The Length of Your Stay***\n");
    printf("Input check-in date (DD,MM,YYYY):\n");
    scanf("%d,%d,%d", &cust->check_in.day, &cust->check_in.month, &cust->check_in.year);
    printf("\nInput check-out date (DD,MM,YYYY):\n");
    scanf("%d,%d,%d", &cust->check_out.day, &cust->check_out.month, &cust->check_out.year);

    struct Date D1 = cust->check_in, D2 = cust->check_out;
    int days = getDays(D1, D2);
    printf("The total days you are staying is %d days, type of room %d, number of room %d", days, type, num_of_room);
    cust->bill = getBill(days, type, num_of_room);
    printf("\nYou need to pay for $%d", cust->bill);
    return 0;
}

内容的提问来源于stack exchange，提问作者Maria Marchella Gandhi