顺序队列之C++实现

          下面介绍下用C++实现的顺序队列，在VC6下调试通过。

1、文件组织形式

2、sq.h顺序队列类的说明

#ifndef _SQ_H_
#define _SQ_H_

typedef int dataType;
#define maxSize 100

class sq
{
public:
	sq();
	//~sq();
	void push(dataType var);
	void pop();
	dataType front();
	bool isEmpty();
	bool isFull();

private:
	dataType queue[maxSize];
	int head;
	int tail;
};

#endif

3、sq.cpp顺序队列类的定义

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

sq::sq()
{
	head = -1;   
	tail = -1;
}

void sq::push(dataType var)
{
	queue[++tail] = var;

	if(tail == 0) 
	{
		head = 0;
	}
}

void sq::pop()
{
	++head;
}

dataType sq::front()
{
	return queue[head];
}

bool sq::isEmpty()
{
	bool flag = head > tail;     //当head和tail不为-1时

	if(head == -1 && tail == -1) //当head=tail=-1时
	{
		flag = true;
	}

	if(flag)
	{
		head = tail = -1;
	}

	return flag;
}

bool sq::isFull()
{
	return tail == maxSize-1;
}

4、main.cpp

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

int main()
{
	sq exp;
	int i = 0;

	for(i=0;i<maxSize+10;++i)
	{
		if(!exp.isFull())
		{
			exp.push(i);
		}
	}
	

	for(i=0;i<maxSize+20;++i)
	{
		if(!exp.isEmpty())
		{
			cout<<exp.front()<<endl;
			exp.pop();
		}
	}

	if(exp.isEmpty())
	{
		cout<<"队列已空!"<<endl;
	}

	return 0;
}