Queue.cpp

#include <iostream>
#include <stdlib.h>//system()
#include <conio.h>//getch()
#define MAX 20 //maksimum data queue
using namespace std;

//Deklarasi struct antrian
struct queue {
	int head, tail, data[MAX];
}Q;
//11.12.5800
//cek apakah antrian penuh
bool isFull() {
	//return Q.tail == MAX ? true : false; 
	return Q.tail == MAX; //GOTCHA!!
}

//cek apakah antrian kosong
bool isEmpty() {
	return Q.tail == 0;
}

//Menampilkan Queue
void print() {
	if (!isEmpty()) {
		cout << "QUEUE : ";
		for (int i = Q.head; i < Q.tail; i++)
		//print data menggunakan ternary operator 
		//menambahkan koma jika data tidak terdapat di antrian pertama
			//cout << Q.data[i] << Q.tail - 1 == i ? "" : ","; 
			cout << Q.data[i] << ((Q.tail - 1 == i) ? "" : ","); //GOTCHA!!
		cout << endl;
	}
	else cout << "Antrian kosong";
}

//manambahkan data ke antrian
void enqueue() {
	if (!isFull())
	{
		int data;
		//menambahkan data ke antrian
		cout << "Masukkan Data : ";cin >> data;
		Q.data[Q.tail] = data;
		//menempatkan tail pada elemen data terakhir yang ditambahkan
		Q.tail++;
		cout << "Data ditambahkan\n";
		print();
	}
	else cout << "Antrian penuh!";
}

// mengambil data dari antrian
void dequeue() {
	if (!isEmpty())
	{
		cout << "Mengambil data \"" << Q.data[Q.head] << "\"..." << endl;
		//menggeser antrian data ke head
		for (int i = Q.head; i < Q.tail; i++)
			Q.data[i] = Q.data[i + 1];
		//menempatkan tail pada data terakhir yang digeser
		Q.tail--;
		print();
	}
	else cout << "Antrian kosong";
}

int main() {
	int choose;
	do
	{
		system("cls"); //hanya di windows
		//Tampilan menu
		cout << "-------------------\n" 
			<< "   Menu Pilihan\n"
			<< "-------------------\n"
			<< " [1] Enqueue \n"
			<< " [2] Dequeue\n"
			<< " [3] Tampil \n"
			<< " [4] Keluar \n\n"
			<< "-------------------\n"
			<< "Masukkan pilihan : "; cin >> choose;
		switch (choose)
		{
		case 1:
			enqueue();
			break;
		case 2:
			dequeue();
			break;
		case 3:
			print();
			break;
		default:
			cout << "Pilihan tidak tersedia";
			break;
		}
		cout << "\nPress Any key to continue...";
		getch();
	} while (choose !=4);
	return 0;
}