Методы с string очередью - разобрать код - C#
Формулировка задачи:
Не могу понять как отрабатываю два последних метода. Помогите срочно пожалуйста.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FIFO
{
class Program
{
static void Main(string[] args)
{
try
{
Queue q1 = new Queue();
q1.Add(4);
q1.Add(5);
Console.WriteLine("В передней части {0}", q1.Head());
q1.Add(6);
Console.WriteLine("Удаление из очереди {0}", q1.Remove());
Console.WriteLine("Очередь имеет размер {0}", q1.size);
Console.WriteLine("Очередь пустая? {0}", q1.IsEmpty());
q1.Remove();
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.ReadKey();
}
public class Queue
{
private string[] data;
public int size;
private int front = -1;
private int back = 0;
private int count = 0;
public Queue()
{
size = 10;
data = new string[size];
}
public Queue(int size)
{
this.size = size;
data = new string[size];
}
public bool IsEmpty()
{
return count == 0;
}
public bool IsFull()
{
return count == size;
}
public void Add(int i)
{
if (IsFull())
throw new ApplicationException("Очередь заполнена");
else
{
count++;
data[back++ % size] = Convert.ToString(i);
}
}
public string Remove()
{
if (IsEmpty())
throw new ApplicationException("Очередь пуста");
else
{
count--;
return data[++front % size];
}
}
public string Head()
{
if (IsEmpty())
{
throw new ApplicationException("Очередь пуста");
}
else
return data[(front + 1) % size];
}
}
}
}Решение задачи: «Методы с string очередью - разобрать код»
textual
Листинг программы
namespace System.Collections {
using System;
using System.Security.Permissions;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.Contracts;
[DebuggerTypeProxy(typeof(System.Collections.Queue.QueueDebugView))]
[DebuggerDisplay("Count = {Count}")]
[System.Runtime.InteropServices.ComVisible(true)]
[Serializable]
public class Queue : ICollection, ICloneable {
private Object[] _array;
private int _head;
private int _tail;
private int _size;
private int _growFactor;
private int _version;
[NonSerialized]
private Object _syncRoot;
private const int _MinimumGrow = 4;
private const int _ShrinkThreshold = 32;
.
public Queue()
: this(32, (float)2.0) {
}
public Queue(int capacity)
: this(capacity, (float)2.0) {
}
public Queue(int capacity, float growFactor) {
if (capacity < 0)
throw new ArgumentOutOfRangeException("capacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
if (!(growFactor >= 1.0 && growFactor <= 10.0))
throw new ArgumentOutOfRangeException("growFactor", Environment.GetResourceString("ArgumentOutOfRange_QueueGrowFactor", 1, 10));
Contract.EndContractBlock();
_array = new Object[capacity];
_head = 0;
_tail = 0;
_size = 0;
_growFactor = (int)(growFactor * 100);
}
public Queue(ICollection col) : this((col==null ? 32 : col.Count))
{
if (col==null)
throw new ArgumentNullException("col");
Contract.EndContractBlock();
IEnumerator en = col.GetEnumerator();
while(en.MoveNext())
Enqueue(en.Current);
}
public virtual int Count {
get { return _size; }
}
public virtual Object Clone() {
Queue q = new Queue(_size);
q._size = _size;
int numToCopy = _size;
int firstPart = (_array.Length - _head < numToCopy) ? _array.Length - _head : numToCopy;
Array.Copy(_array, _head, q._array, 0, firstPart);
numToCopy -= firstPart;
if (numToCopy > 0)
Array.Copy(_array, 0, q._array, _array.Length - _head, numToCopy);
q._version = _version;
return q;
}
public virtual bool IsSynchronized {
get { return false; }
}
public virtual Object SyncRoot {
get {
if( _syncRoot == null) {
System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null);
}
return _syncRoot;
}
}
public virtual void Clear() {
if (_head < _tail)
Array.Clear(_array, _head, _size);
else {
Array.Clear(_array, _head, _array.Length - _head);
Array.Clear(_array, 0, _tail);
}
_head = 0;
_tail = 0;
_size = 0;
_version++;
}
public virtual void CopyTo(Array array, int index)
{
if (array==null)
throw new ArgumentNullException("array");
if (array.Rank != 1)
throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported"));
if (index < 0)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index"));
Contract.EndContractBlock();
int arrayLen = array.Length;
if (arrayLen - index < _size)
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
int numToCopy = _size;
if (numToCopy == 0)
return;
int firstPart = (_array.Length - _head < numToCopy) ? _array.Length - _head : numToCopy;
Array.Copy(_array, _head, array, index, firstPart);
numToCopy -= firstPart;
if (numToCopy > 0)
Array.Copy(_array, 0, array, index+_array.Length - _head, numToCopy);
}
public virtual void Enqueue(Object obj) {
if (_size == _array.Length) {
int newcapacity = (int)((long)_array.Length * (long)_growFactor / 100);
if (newcapacity < _array.Length + _MinimumGrow) {
newcapacity = _array.Length + _MinimumGrow;
}
SetCapacity(newcapacity);
}
_array[_tail] = obj;
_tail = (_tail + 1) % _array.Length;
_size++;
_version++;
}
public virtual IEnumerator GetEnumerator()
{
return new QueueEnumerator(this);
}
public virtual Object Dequeue() {
if (Count == 0)
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EmptyQueue"));
Contract.EndContractBlock();
Object removed = _array[_head];
_array[_head] = null;
_head = (_head + 1) % _array.Length;
_size--;
_version++;
return removed;
}
public virtual Object Peek() {
if (Count == 0)
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EmptyQueue"));
Contract.EndContractBlock();
return _array[_head];
}
[HostProtection(Synchronization=true)]
public static Queue Synchronized(Queue queue)
{
if (queue==null)
throw new ArgumentNullException("queue");
Contract.EndContractBlock();
return new SynchronizedQueue(queue);
}
public virtual bool Contains(Object obj) {
int index = _head;
int count = _size;
while (count-- > 0) {
if (obj == null) {
if (_array[index] == null)
return true;
} else if (_array[index] != null && _array[index].Equals(obj)) {
return true;
}
index = (index + 1) % _array.Length;
}
return false;
}
internal Object GetElement(int i)
{
return _array[(_head + i) % _array.Length];
}
public virtual Object[] ToArray()
{
Object[] arr = new Object[_size];
if (_size==0)
return arr;
if (_head < _tail) {
Array.Copy(_array, _head, arr, 0, _size);
} else {
Array.Copy(_array, _head, arr, 0, _array.Length - _head);
Array.Copy(_array, 0, arr, _array.Length - _head, _tail);
}
return arr;
}
private void SetCapacity(int capacity) {
Object[] newarray = new Object[capacity];
if (_size > 0) {
if (_head < _tail) {
Array.Copy(_array, _head, newarray, 0, _size);
} else {
Array.Copy(_array, _head, newarray, 0, _array.Length - _head);
Array.Copy(_array, 0, newarray, _array.Length - _head, _tail);
}
}
_array = newarray;
_head = 0;
_tail = (_size == capacity) ? 0 : _size;
_version++;
}
public virtual void TrimToSize()
{
SetCapacity(_size);
}
[Serializable]
private class SynchronizedQueue : Queue
{
private Queue _q;
private Object root;
internal SynchronizedQueue(Queue q) {
this._q = q;
root = _q.SyncRoot;
}
public override bool IsSynchronized {
get { return true; }
}
public override Object SyncRoot {
get {
return root;
}
}
public override int Count {
get {
lock (root) {
return _q.Count;
}
}
}
public override void Clear() {
lock (root) {
_q.Clear();
}
}
public override Object Clone() {
lock (root) {
return new SynchronizedQueue((Queue)_q.Clone());
}
}
public override bool Contains(Object obj) {
lock (root) {
return _q.Contains(obj);
}
}
public override void CopyTo(Array array, int arrayIndex) {
lock (root) {
_q.CopyTo(array, arrayIndex);
}
}
public override void Enqueue(Object value) {
lock (root) {
_q.Enqueue(value);
}
}
[SuppressMessage("Microsoft.Contracts", "CC1055")]
public override Object Dequeue() {
lock (root) {
return _q.Dequeue();
}
}
public override IEnumerator GetEnumerator() {
lock (root) {
return _q.GetEnumerator();
}
}
[SuppressMessage("Microsoft.Contracts", "CC1055")]
public override Object Peek() {
lock (root) {
return _q.Peek();
}
}
public override Object[] ToArray() {
lock (root) {
return _q.ToArray();
}
}
public override void TrimToSize() {
lock (root) {
_q.TrimToSize();
}
}
}
[Serializable]
private class QueueEnumerator : IEnumerator, ICloneable
{
private Queue _q;
private int _index;
private int _version;
private Object currentElement;
internal QueueEnumerator(Queue q) {
_q = q;
_version = _q._version;
_index = 0;
currentElement = _q._array;
if (_q._size == 0)
_index = -1;
}
public Object Clone()
{
return MemberwiseClone();
}
public virtual bool MoveNext() {
if (_version != _q._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion));
if (_index < 0) {
currentElement = _q._array;
return false;
}
currentElement = _q.GetElement(_index);
_index++;
if (_index == _q._size)
_index = -1;
return true;
}
public virtual Object Current {
get {
if (currentElement == _q._array)
{
if (_index == 0)
throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted));
else
throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded));
}
return currentElement;
}
}
public virtual void Reset() {
if (_version != _q._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion));
if (_q._size == 0)
_index = -1;
else
_index = 0;
currentElement = _q._array;
}
}
internal class QueueDebugView {
private Queue queue;
public QueueDebugView( Queue queue) {
if( queue == null)
throw new ArgumentNullException("queue");
Contract.EndContractBlock();
this.queue = queue;
}
[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
public Object[] Items {
get {
return queue.ToArray();
}
}
}
}
}