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c_cpp
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#include <iostream>
using namespace std;

// Deklarasi Struct Node
struct Node {
    string data;
    Node *next;
};

Node *head, *tail, *baru, *bantu, *hapus;

void init() {
    head = NULL;
    tail = head;
}

// Pengecekan
int isEmpty() {
    if (head == NULL)
        return 1; // true
    else
        return 0; // false
}

// Buat Node Baru
void buatNode(string data) {
    baru = new Node;
    baru->data = data;
    baru->next = NULL;
}

// Hitung List
int hitungList() {
    bantu = head;
    int jumlah = 0;
    while (bantu != NULL) {
        jumlah++;
        bantu = bantu->next;
    }
    return jumlah;
}

// Tambah Depan
void insertDepan(string data) {
    // Buat Node baru
    buatNode(data);
    if (isEmpty() == 1) {
        head = baru;
        tail = head;
        baru->next = head;
    } else {
        while (tail->next != head) {
            tail = tail->next;
        }
        baru->next = head;
        head = baru;
        tail->next = head;
    }
}

// Tambah Belakang
void insertBelakang(string data) {
    // Buat Node baru
    buatNode(data);
    if (isEmpty() == 1) {
        head = baru;
        tail = head;
        baru->next = head;
    } else {
        while (tail->next != head) {
            tail = tail->next;
        }
        tail->next = baru;
        baru->next = head;
    }
}

// Tambah Tengah
void insertTengah(string data, int posisi) {
    if (isEmpty() == 1) {
        head = baru;
        tail = head;
        baru->next = head;
    } else {
        baru->data = data;
        // transversing
        int nomor = 1;
        bantu = head;
        while (nomor < posisi - 1) {
            bantu = bantu->next;
            nomor++;
        }
        baru->next = bantu->next;
        bantu->next = baru;
    }
}

// Hapus Depan
void hapusDepan() {
    if (isEmpty() == 0) {
        hapus = head;
        tail = head;
        if (hapus->next == head) {
            head = NULL;
            tail = NULL;
        } else {
            delete hapus;
            while (tail->next != hapus) {
                tail = tail->next;
            }
            head = head->next;
            tail->next = head;
            hapus->next = NULL;
            delete hapus;
        }
    } else {
        cout << "List masih kosong!" << endl;
    }
}

// Hapus Belakang
void hapusBelakang() {
    if (isEmpty() == 0) {
        hapus = head;
        tail = head;
        if (hapus->next == head) {
            head = NULL;
            tail = NULL;
        } else {
            delete hapus;
            while (hapus->next != head) {
                hapus = hapus->next;
            }
            while (tail->next != hapus) {
                tail = tail->next;
            }
            tail->next = head;
            hapus->next = NULL;
            delete hapus;
        }
    } else {
        cout << "List masih kosong!" << endl;
    }
}

// Hapus Tengah
void hapusTengah(int posisi) {
    if (isEmpty() == 0) {
        // transversing
        int nomor = 1;
        bantu = head;
        while (nomor < posisi - 1) {
            bantu = bantu->next;
            nomor++;
        }
        hapus = bantu->next;
        bantu->next = hapus->next;
        delete hapus;
    } else {
        cout << "List masih kosong!" << endl;
    }
}

// Hapus List
void clearList() {
    if (head != NULL) {
        hapus = head->next;
        while (hapus != head) {
            bantu = hapus->next;
            delete hapus;
            hapus = bantu;
        }
        delete head;
        head = NULL;
    }
    cout << "List berhasil terhapus!" << endl;
}

// Tampilkan List
void tampil() {
    if (isEmpty() == 0) {
        tail = head;
        do {
            cout << tail->data << ends;
            tail = tail->next;
        } while (tail != head);
        cout << endl;
    } else {
        cout << "List masih kosong!" << endl;
    }
}

int main() {
    init();
    insertDepan("Ayam");
    tampil();
    insertDepan("Bebek");
    tampil();
    insertBelakang("Cicak");
    tampil();
    insertBelakang("Domba");
    tampil();
    hapusBelakang();
    tampil();
    hapusDepan();
    tampil();
    insertTengah("Sapi", 2);
    tampil();
    hapusTengah(2);
    tampil();
    return 0;
}
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