队列

// duilie.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include <stdlib.h>
using namespace std;

struct QueueRecord;
typedef struct QueueRecord *Queue;


int IsEmpty(Queue Q);
int IsFull(Queue Q);
Queue CreateQueue(int MaxElement);
void DisposeQueue(Queue Q);
void MakeEmpty(Queue Q);
void Enqueue(ElementType x, Queue Q);
ElementType Dequeue(Queue Q);



#define MinQueueSize (5)
typedef int ElementType;

struct QueueRecord
{
	int Capacity;
	int Front;
	int Rear;
	int Size;
	ElementType *Array;
};

Queue CreateQueue(int MaxElement)
{
	Queue Q;
	if (MaxElement < MinQueueSize)
		cout << "too small";
	Q = (Queue)malloc(sizeof(QueueRecord));
	if (Q == NULL)
		cout << "out of space";
	Q->Array= (ElementType *)malloc(sizeof(ElementType)*MaxElement);
	if (Q->Array == NULL)
		cout << "out of space";
	Q->Capacity = MaxElement;
	MakeEmpty(Q);
	return Q;
}

void DisposeQueue(Queue Q)
{
	if (Q != NULL)
	{
		free(Q->Array);
		free(Q);
	}
}

int IsEmpty(Queue Q)
{
	return Q->Size == 0;
}

void MakeEmpty(Queue Q)
{
	Q->Size = 0;
	Q->Front = 1;
	Q->Rear = 0;
}

static int Succ(int Value, Queue Q)
{
	if (++Value == Q->Capacity)
		Value = 0;
	return Value;
}
void Enqueue(ElementType x, Queue Q)
{
	if (IsFull(Q))
		cout << "full";
	else
	{
		Q->Size ++;
		Q->Rear = Succ(Q->Rear,Q);
		Q->Array[Q->Rear] = x;
	}
}

int IsFull(Queue Q)
{
	return (Q->Rear) - (Q->Front) == -1;
}

ElementType Dequeue(Queue Q)
{
	ElementType x;
	if (IsEmpty(Q))
	{
		cout << "Empty";
		return 0;
	}
	else
	{
		x = Q->Array[Q->Front];
		Q->Size--;
		Q->Front = Succ(Q->Front, Q);
		return x;
	}
}

void print(Queue Q)
{
	for (int i = 0; i <Q->Size; i++)
		cout << Q->Array[i] << "  ";
	cout << endl;
}

int main()
{
	Queue Q = CreateQueue(10);
	Enqueue(10, Q);
	Enqueue(5, Q);
	print(Q);
	ElementType e = Dequeue(Q);
	print(Q);
	while (1);
    return 0;
}