/**
* file rr_kozynets.c
* author Козинець Т.М. гр. 515, варіант 4
* date 22.05.2025
* brief Розрахункова робота
*
* База даних перельотів
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct Flight {
char departure[50];
char destination[50];
int flightNumber;
char planeType[30];
int seatCount;
struct Flight *next;
} Flight;
Flight* loadFlights(const char *filename) {
FILE *file = fopen(filename, "rb");
if (!file) return NULL;
Flight *head = NULL, *last = NULL;
Flight temp;
while (fread(&temp, sizeof(Flight) - sizeof(Flight*), 1, file)) {
Flight *newNode = (Flight*)malloc(sizeof(Flight));
memcpy(newNode, &temp, sizeof(Flight) - sizeof(Flight*));
newNode->next = NULL;
if (!head)
head = newNode;
else
last->next = newNode;
last = newNode;
}
fclose(file);
return head;
}
void saveFlights(const char *filename, Flight *head) {
FILE *file = fopen(filename, "wb");
if (!file) return;
while (head) {
fwrite(head, sizeof(Flight) - sizeof(Flight*), 1, file);
head = head->next;
}
fclose(file);
}
void addFlight(Flight **head) {
Flight *newNode = (Flight*)malloc(sizeof(Flight));
printf("Enter departure: ");
scanf("%s", newNode->departure);
printf("Enter destination: ");
scanf("%s", newNode->destination);
printf("Enter flight number: ");
scanf("%d", &newNode->flightNumber);
printf("Enter plane type: ");
scanf("%s", newNode->planeType);
printf("Enter seat count: ");
scanf("%d", &newNode->seatCount);
newNode->next = *head;
*head = newNode;
}
void deleteFlight(Flight **head, int flightNumber) {
Flight *curr = *head, *prev = NULL;
while (curr && curr->flightNumber != flightNumber) {
prev = curr;
curr = curr->next;
}
if (!curr) {
printf("Flight not found.\n");
return;
}
if (!prev)
*head = curr->next;
else
prev->next = curr->next;
free(curr);
}
void editFlight(Flight *head, int flightNumber) {
while (head && head->flightNumber != flightNumber)
head = head->next;
if (!head) {
printf("Flight not found.\n");
return;
}
printf("New departure: ");
scanf("%s", head->departure);
printf("New destination: ");
scanf("%s", head->destination);
printf("New plane type: ");
scanf("%s", head->planeType);
printf("New seat count: ");
scanf("%d", &head->seatCount);
}
void viewFlights(Flight *head) {
while (head) {
printf("Flight %d: %s -> %s, Plane: %s, Seats: %d\n",
head->flightNumber, head->departure, head->destination,
head->planeType, head->seatCount);
head = head->next;
}
}
void findByDestination(Flight *head, const char *dest) {
while (head) {
if (strcmp(head->destination, dest) == 0)
printf("Flight %d, Plane: %s\n", head->flightNumber, head->planeType);
head = head->next;
}
}
void findByPlaneType(Flight *head, const char *type) {
while (head) {
if (strcmp(head->planeType, type) == 0)
printf("Flight %d: %s -> %s, Seats: %d\n", head->flightNumber,
head->departure, head->destination, head->seatCount);
head = head->next;
}
}
void freeList(Flight *head) {
while (head) {
Flight *tmp = head;
head = head->next;
free(tmp);
}
}
int checkLicenseKey(const char *key) {
return strncmp(key, "01AF", 4) == 0;
}
void loadConfig(char *filename, char *key) {
FILE *conf = fopen("config.txt", "r");
if (!conf) {
printf("config.txt not found!\n");
exit(1);
}
fscanf(conf, "DB = %s\nKEY = %s", filename, key);
fclose(conf);
}
int main() {
char filename[100], key[20];
loadConfig(filename, key);
if (!checkLicenseKey(key)) {
printf("Invalid license key!\n");
return 1;
}
Flight *head = loadFlights(filename);
int choice;
while (1) {
printf("\nMenu:\n1. Add\n2. Delete\n3. Edit\n4. View all\n5. Find by destination\n6. Find by plane type\n7. Exit\n");
scanf("%d", &choice);
if (choice == 1)
addFlight(&head);
else if (choice == 2) {
int num;
printf("Flight number: ");
scanf("%d", &num);
deleteFlight(&head, num);
}
else if (choice == 3) {
int num;
printf("Flight number: ");
scanf("%d", &num);
editFlight(head, num);
}
else if (choice == 4)
viewFlights(head);
else if (choice == 5) {
char dest[50];
printf("Destination: ");
scanf("%s", dest);
findByDestination(head, dest);
}
else if (choice == 6) {
char type[30];
printf("Plane type: ");
scanf("%s", type);
findByPlaneType(head, type);
}
else
break;
}
saveFlights(filename, head);
freeList(head);
return 0;
}
