1  /*
  2  * FILE : m3.cpp
  3  * PROJECT : SENG1000 - MAJOR ASSIGNMENT 3
  4  * PROGRAMMER : Tian Yang, 8952896
  5  * FIRST VERSION : 2024-02-15
  6  * DESCRIPTION :
  7  * This program calculate hotel bills for a meeting.
  8  */
  9  
 10  #include <stdio.h>
 11  #include <string.h>
 12  
 13  #define BUFFER_SIZE 1024
 14  #define NAME_LENGTH 32
 15  
 16  const int kError = -1;
 17  const char* kWeekdays[] = { "sun", "mon", "tue", "wed", "thu", "fri", "sat" };
 18  
 19  int indexTheDay(const char*);
 20  double calculateCostOfRoom(const double[], int, int);
 21  
 22  int main(void)
 23  {
 24  	const double kRoomRate[] = { 137.50, 138.25, 130.50, 150, 150, 162.50 };
 25  	const int kCountOfPeople = 4;
 26  	double total = 0.0;
 27  	for (int i = 0; i < kCountOfPeople; i++)
 28  	{
 29  		char buffer[BUFFER_SIZE] = "";
 30  		char name[NAME_LENGTH] = "";
 31  		printf("Enter Name: ");
 32  		fgets(buffer, BUFFER_SIZE, stdin);
 33  		sscanf(buffer, "%[^\n]", name);
 34  		if (name[0] == '\0')
 35  		{
 36  			printf("Invalid name entry. Moving on to next guest...\n");
 37  			printf("\n");
 38  			continue;
 39  		}
 40  
 41  		char checkInDay[4] = "";
 42  		int checkIn = kError;
 43  		printf("Enter check-in day: ");
 44  		fgets(buffer, BUFFER_SIZE, stdin);
 45  		sscanf(buffer, "%s\n", checkInDay);
 46  		checkIn = indexTheDay(checkInDay);
 47  		if (checkIn == kError)
 48  		{
 49  			printf("Invalid check-in day. Moving on to next guest...\n");
 50  			printf("\n");
 51  			continue;
 52  		}
 53  		if ((checkIn > 4)) // Index of Thursday.
 54  		{
 55  			printf("This person is missing the meeting. Moving on to next guest...\n");
 56  			printf("\n");
 57  			continue;
 58  		}
 59  
 60  		char checkOutDay[4] = "";
 61  		int checkOut = kError;
 62  		printf("Enter check-out day: ");
 63  		fgets(buffer, BUFFER_SIZE, stdin);
 64  		sscanf(buffer, "%s\n", checkOutDay);
 65  		checkOut = indexTheDay(checkOutDay);
 66  		if(checkOut == kError)
 67  		{
 68  			printf("Invalid check-out day. Moving on to next guest...\n");
 69  			printf("\n");
 70  			continue;
 71  		}
 72  		if (checkOut < 4) // Index of Thursday.
 73  		{
 74  			printf("This person is missing the meeting. Moving on to next guest...\n");
 75  			printf("\n");
 76  			continue;
 77  		}
 78  		
 79  		if ((checkOut - checkIn) < 1)
 80  		{
 81  			printf("Invalid length of stay. Moving on to next guest...\n");
 82  			printf("\n");
 83  			continue;
 84  		}
 85  
 86  		double cost = calculateCostOfRoom(kRoomRate, checkIn, checkOut);
 87  		printf("The total room cost for %s is %.2f\n", name, cost);
 88  		printf("\n");
 89  		total += cost;
 90  	}
 91  	printf("Grand total : %.2f", total);	
 92  
 93  	return 0;
 94  }
 95  
 96  //
 97  // FUNCTION : indexTheDay
 98  // DESCRIPTION :
 99  // This function converts from the user input to a useful array index
100  // PARAMETERS :
101  // const char* day : day string.
102  // RETURNS :
103  // int : index of day.
104  //
105  int indexTheDay(const char* day)
106  {
107  	for (int i = 0; i < 7; i++)
108  	{
109  		if (strcmp(day, kWeekdays[i]) == 0)
110  			return i;
111  	}
112  	return kError;
113  }
114  
115  //
116  // FUNCTION : calculateCostOfRoom
117  // DESCRIPTION :
118  // This function calculates the cost of the room for a person.
119  // PARAMETERS :
120  // const double roomRate[] : room rate.
121  // int checkIn: check-in day.
122  // int checkOut: check-out day.
123  // RETURNS :
124  // double : total cost of the room.
125  //
126  double calculateCostOfRoom(const double roomRate[], int checkIn, int checkOut)
127  {
128  	double cost = 0.0;
129  	for (int i = checkIn; i < checkOut; i++)
130  	{
131  		cost += roomRate[i];
132  	}
133  	return cost;
134  }