C语言使用头文件实例

/* hotel.h -- constants and declarations for hotel.c */
#define QUIT       5
#define HOTEL1   180.00
#define HOTEL2   225.00
#define HOTEL3   255.00
#define HOTEL4   355.00
#define DISCOUNT   0.95
#define STARS "**********************************"

// shows list of choices
int menu(void);

// returns number of nights desired
int getnights(void);

// calculates price from rate, nights
// and displays result
void showprice(double rate, int nights);

/* usehotel.c -- room rate program */
/* compile with  Listing 9.10      */
#include <stdio.h>
#include "hotel.h" /* defines constants, declares functions */

int main(void)
{
    int nights;
    double hotel_rate;
    int code;

    while ((code = menu()) != QUIT)
    {
        switch(code)
        {
            case 1 : hotel_rate = HOTEL1;
                break;
            case 2 : hotel_rate = HOTEL2;
                break;
            case 3 : hotel_rate = HOTEL3;
                break;
            case 4 : hotel_rate = HOTEL4;
                break;
            default: hotel_rate = 0.0;
                printf("Oops!\n");
                break;
        }
        nights = getnights();
        showprice(hotel_rate, nights);
    }
    printf("Thank you and goodbye.\n");

    return 0;
}