Data Struct

#include <iostream>

using namespace std;

void tambahdepan();
void tambahbelakang();
void tambahtengah();
void buangdepan();
void buangbelakang();
void buangtengah();
void cari();
void papar();

struct LL {

	int data;
	LL * next;
};

struct LL * head;

int main(void){
	head = NULL;
	int pilihan;

	while(true){
	cout << endl << endl <<"Pilih operasi anda :" <<endl;
	cout << "1. Tambah data di depan" << endl;
	cout << "2. Tambah data di belakang" << endl;
	cout << "3. Tambah data di tengah" << endl;
	cout << "4. Buang data di depan" << endl;
	cout << "5. Buang data di belakang" << endl;
	cout << "6. Buang data di tengah" << endl;
	cout << "7. Cari data" << endl;
	cout << "8. Papar data" << endl;
	cout << "9. Keluar" << endl;
	cout << "Pilihan Anda: ";
	cin >> pilihan;

	switch(pilihan){
	case 1 : tambahdepan(); papar(); break;
	case 2 : tambahbelakang(); break;
	case 3 : tambahtengah(); break;
	case 4 : buangdepan(); break;
	case 5 : buangbelakang(); break;
	case 6 : buangtengah(); break;
	case 7 : cari(); break;
	case 8 : papar(); break;
	case 9 : return 0 ;break;
	default: cout << "Wrong Selection"; break;
		}


	}
	system("pause");
	return 0;
}


void tambahdepan(){

	LL * objek = new LL;
	cout << endl << "Insert a number: " ;
	cin >> objek -> data;
	cout <<endl;

	if(head == NULL){
	objek -> next = NULL;
	}else {
	objek -> next = head;
	}

	head = objek;
}
void tambahbelakang() {

}
void tambahtengah(){
}
void buangdepan(){
}
void buangbelakang(){
}
void buangtengah(){
}
void cari(){
}
void papar(){
	LL * tmp = head;
	cout << "HEAD->";
	while(tmp != NULL){
		cout << tmp -> data << "->";
		tmp = tmp -> next;
	}
	cout << "NULL";
	delete tmp;

}