using System;
public class Queue {
private int[] data;
private int size;
private int front = -1;
private int back = 0;
private int count = 0;
public Queue() {
size = 10;
data = new int[size];
}
public Queue(int size) {
this.size = size;
data = new int[size];
}
public bool IsEmpty() {
return count == 0;
}
public bool IsFull() {
return count == size;
}
public void Add(int i){
if (IsFull())
throw new ApplicationException("Queue full");
else {
count++;
data[back++ % size] = i;
}
}
public int Remove(){
if (IsEmpty())
throw new ApplicationException("Queue empty");
else {
count--;
return data[++front % size];
}
}
public int Head(){
if (IsEmpty()){
throw new ApplicationException("Queue empty");
}
else
return data[(front+1) % size];
}
public static void Main() {
try {
Queue q1 = new Queue();
q1.Add(4);
q1.Add(5);
Console.WriteLine("The front is now {0}", q1.Head());
q1.Add(6);
Console.WriteLine("Removing from q1 returns {0}", q1.Remove());
Console.WriteLine("Queue 1 has size {0}", q1.size);
Console.WriteLine("Queue 1 empty? {0}", q1.IsEmpty());
q1.Remove();
Console.WriteLine("Throws exception before we get here");
}catch(Exception e) {
Console.WriteLine(e);
}
}
}
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