#include <iostream>
#include <string>
#include "queue.h"
using namespace std;

int Queue::Length()
{
	if (back < front) {
		return DATA_SIZE - front + back;
	}
	return back - front;
}

void Queue::PushBack(string s)
{
	data[back] = s;
	back++;
	if (back == DATA_SIZE) {
		back = 0;
	}
}

string Queue::PopFront()
{
	string temp = data[front];
	front++;
	if (front == DATA_SIZE) {
		front = 0;
	}
	return temp;
}