bool isPrime(int num) {
if (num <= 1) return false; // 0 and 1 are not prime numbers for (int i = 2; i * i <= num; i++) { // check divisors from 2 to sqrt(num) if (num % i == 0) return false; // if divisible, it's not prime } return true; // no divisors found, it's prime } void main() { stdout.write("Enter a number: "); int? number = int.tryParse(stdin.readLineSync()!); if (number != null) { if (isPrime(number)) { print("$number is a prime number."); } else { print("$number is not a prime number."); } } else { print("Invalid input. Please enter an integer."); } }

class Item {
String name;
Item(this.name);
}

class Room {
String description;
List items = [];

Room(this.description);

void addItem(Item item) {
items.add(item);
}

void showItems() {
print(“Items in this room: “);
if (items.isEmpty) {
print(“None.”);
} else {
for (var item in items) {
stdout.write(“${item.name} “);
}
print(“”);
}
}
}

class Game {
List rooms = [];
Room? currentRoom;
List inventory = [];

Game() {
rooms.add(Room(“You are in a dimly lit room filled with old furniture.”));
rooms.add(Room(“You have entered a bright kitchen with a strange smell.”));
rooms.add(Room(“This is a library with shelves full of dusty books.”));
rooms.add(Room(“You find yourself in a spooky basement with noises echoing around.”));

rooms[0].addItem(Item(“Old Key”));
rooms[1].addItem(Item(“Mystical Potion”));
rooms[2].addItem(Item(“Ancient Book”));
rooms[3].addItem(Item(“Lantern”));

currentRoom = rooms[0];
Random().seed(DateTime.now().millisecondsSinceEpoch);
}

void showIntro() {
print(“Welcome to the Adventure Game!”);
print(“You can explore different rooms, pick up items, and encounter random events.”);
print(“Type ‘exit’ to quit the game.”);
}

void displayCurrentRoom() {
print(currentRoom!.description);
currentRoom!.showItems();
}

void pickUpItem(String itemName) {
var it = currentRoom!.items.firstWhere(
(item) => item.name == itemName,
orElse: () => null,
);

if (it != null) {
inventory.add(it);
currentRoom!.items.remove(it);
print(“You picked up: $itemName”);
} else {
print(“Item not found in this room.”);
}
}

void randomEvent() {
if (Random().nextBool()) {
print(“You encountered a mysterious figure! They vanish into thin air.”);
} else {
print(“A ghost appears! It smiles and offers you a clue.”);
}
}

void start() {
showIntro();

while (true) {
displayCurrentRoom();
stdout.write(“What do you want to do? (pick [item], explore, event, inventory, exit): “);
String command = stdin.readLineSync()!;

if (command == “exit”) {
break;
} else if (command.startsWith(“pick “)) {
String itemName = command.substring(5);
pickUpItem(itemName);
} else if (command == “explore”) {
currentRoom = rooms[Random().nextInt(rooms.length)];
print(“You explored to a new room!”);
} else if (command == “event”) {
randomEvent();
} else if (command == “inventory”) {
print(“Your inventory: “);
for (var item in inventory) {
stdout.write(“${item.name} “);
}
print(“”);
} else {
print(“Unknown command.”);
}
}

print(“Thank you for playing!”);
}
}

void main() {
Game game = Game();
game.start();
}