数据结构-循环队列的基本操作代码实现_编写循环代码,实现输入10个数据进队列

（数据结构复习day5）

#include <iostream>
using namespace std;
 
typedef int ElemType;
const int QUEUE_INIT_SIZE = 100;
const int QUEUEINCREMENT = 10;
typedef struct {
	ElemType* data;
	int front;
	int rear;
	int queuesize;
	int incresize;
}SqQueue;
 
bool InitQueue(SqQueue& Q, int = QUEUE_INIT_SIZE, int = QUEUEINCREMENT);//初始化循环队列
int QueueLength(SqQueue Q);//返回队列长度
bool DeQueue(SqQueue& Q, ElemType& e);//将队首元素出队，用e返回
bool EnQueue(SqQueue& Q, ElemType e);//将元素e放入循环队列
bool GetHead(SqQueue Q, ElemType& e);//取队首元素，用e返回
bool incrementQueuesize(SqQueue& Q);//当循环队列空间不足时，动态扩充空间
void TraverseQueue(SqQueue Q);//遍历队列
bool QueueEmpty(SqQueue Q);//判断队列是否为空
bool ClearQueue(SqQueue& Q);//清空队列
 
bool InitQueue(SqQueue& Q, int maxsize, int incresize) {
	Q.data = new ElemType[maxsize];
	if (!Q.data)return 0;
	Q.front = Q.rear = 0;
	Q.queuesize = maxsize;
	Q.incresize = incresize;
	return 1;
}
int QueueLength(SqQueue Q) {
	return (Q.rear - Q.front + Q.queuesize) % Q.queuesize;
}
bool DeQueue(SqQueue& Q, ElemType& e) {
	if (Q.front == Q.rear)
		return 0;
	e = Q.data[Q.front];
	Q.front = (Q.front + 1) % Q.queuesize;
	return 1;
}
bool EnQueue(SqQueue& Q, ElemType e) {
	if ((Q.rear + 1) % Q.queuesize == Q.front)
		if (!incrementQueuesize(Q))
			return 0;
	Q.data[Q.rear] = e;
	Q.rear = (Q.rear + 1) % Q.queuesize;
	return 1;
}
bool GetHead(SqQueue Q, ElemType& e) {
	if (Q.rear == Q.front)
		return 0;
	e = Q.data[Q.front];
	return 1;
}
bool incrementQueuesize(SqQueue& Q) {
	ElemType* newdata = new ElemType[Q.queuesize + Q.incresize];
	if (!newdata)return 0;
	for (int i = 0; i < Q.queuesize; i++)
		newdata[i] = Q.data[(Q.front + i) % Q.queuesize];
	delete[] Q.data;
	Q.data = newdata;
	Q.front = 0; Q.rear = Q.queuesize - 1;
	Q.queuesize += Q.incresize;
	return 1;
}
void TraverseQueue(SqQueue Q) {
	while (Q.front != Q.rear) {
		cout << Q.data[Q.front] << "  ";
		Q.front = (Q.front + 1) % Q.queuesize;
	}
	cout << endl;
}
bool QueueEmpty(SqQueue Q) {
	if (Q.front == Q.rear)
		return 1;
	return 0;
}
bool ClearQueue(SqQueue& Q) {
	Q.front = Q.rear;
	return 1;
}
 
 
int main()
{
	SqQueue Q;
	ElemType e;
	int i;
	if (InitQueue(Q, 8, 2))
		cout << "初始化循环队列成功(8个元素空间)" << endl;
	else {
		cout << "初始化循环队列失败" << endl;
		return 1;
	}
	cout << "请输入10个入队元素：" << endl;
	for (i = 0; i < 10; i++) {
		cin >> e;
		EnQueue(Q, e);
	}
	cout << "队列长度为" << QueueLength(Q);
	cout << "队列中元素为：";
	TraverseQueue(Q);
	cout << "出队5个元素" << endl;
	for (i = 0; i < 5; i++)
		DeQueue(Q, e);
	cout << "队列长度为" << QueueLength(Q) << endl;
	cout << "队列中元素为：";
	TraverseQueue(Q);
	cout << "请再输入6个入队元素：" << endl;
	for (i = 0; i < 6; i++) {
		cin >> e;
		EnQueue(Q, e);
	}
	cout << "队列长度为" << QueueLength(Q) << endl;
	cout << "队列中元素为：";
	TraverseQueue(Q);
	ClearQueue(Q);
	if (QueueEmpty(Q))
		cout << "队列已清空" << endl;
	return 0;
}