《数据结构初阶》之栈和队列

栈功能实现部分

#define  _CRT_SECURE_NO_WARNINGS 1

#include"Stack.h"


//初始化栈
void StackInit(ST* ps)
{
	assert(ps);

	ps->a = NULL;
	ps->top = ps->capacity = 0;

}


//销毁栈
void StackDestroy(ST* ps)
{
	assert(ps);

	free(ps->a);
	ps->a = NULL;
	ps->top = ps->capacity = 0;

}


//向栈中插入数据
void StackPush(ST* ps, STDataType x)
{
	assert(ps);

	if (ps->top == ps->capacity)
	{
		int newcapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		STDataType* tmp = (STDataType*)realloc(ps->a,sizeof(STDataType) * newcapacity);

		if (tmp == NULL)
		{
			printf("realloc fail");
			exit(-1);
		}
		else
		{
			ps->a = tmp;
			ps->capacity = newcapacity;
		}

	}

	ps->a[ps->top] = x;
	ps->top++;

}


//删除栈中的数据
void StackPop(ST* ps)
{
	assert(ps);
	assert(!StackEmpty(ps));

	ps->top--;
}


//检查栈是否为空
bool StackEmpty(ST* ps)
{
	return ps->top == 0;
}


//返回栈顶数据
STDataType StackTop(ST* ps)
{
	assert(ps);
	assert(!StackEmpty(ps));

	return ps->a[ps->top - 1];
}


//返回栈中数据个数
int StackSize(ST* ps)
{
	assert(ps);

	return ps->top;
}

栈头文件部分

#pragma once

#include
#include
#include
#include

typedef int STDataType;
typedef struct Stack
{
	STDataType* a;
	int top;
	int capacity;
}ST;

void StackInit(ST* ps);
void StackDestroy(ST* ps);
void StackPush(ST* ps, STDataType x);
void StackPop(ST* ps);
STDataType StackTop(ST* ps);
int StackSize(ST* ps);
bool StackEmpty(ST* ps);

队列功能实现部分

#define  _CRT_SECURE_NO_WARNINGS 1

#include"Queue.h"


//初始化队列
void QueueInit(Queue* pq)
{
	assert(pq);

	pq->head = NULL;
	pq->tail = NULL;

}


//销毁队列
void QueueDestroy(Queue* pq)
{
	assert(pq);

	QueueNode* cur = pq->head;
	while (cur)
	{
		QueueNode* next = cur->next;
		free(cur);
		cur = next;
	}

	pq->head = pq->tail = NULL;

}


//向队列中插入数据
void QueuePush(Queue* pq, QDataType x)
{
	assert(pq);
	
	QueueNode* newnode = (QueueNode*)malloc(sizeof(QueueNode));
	newnode->data = x;
	newnode->next = NULL;

	if (pq->head == NULL)
	{
		pq->head = pq->tail = newnode;
	}
	else
	{
		pq->tail->next = newnode;
		pq->tail = newnode;
	}

}


//删除队列中的数据
void QueuePop(Queue* pq)
{
	assert(pq);
	assert(!QueueEmpty(pq));

	QueueNode* next = pq->head->next;
	free(pq->head);
	pq->head = next;
	if (pq->head == NULL)
	{
		pq->tail = NULL;
	}

}


//检查队列是否为空
bool QueueEmpty(Queue* pq)
{
	assert(pq);

	return pq->head == NULL;
}


//返回队列头的值
QDataType QueueFront(Queue* pq)
{
	assert(pq);
	assert(!QueueEmpty(pq));

	return pq->head->data;
}


//返回队列尾的值
QDataType QueueBack(Queue* pq)
{
	assert(pq);
	assert(!QueueEmpty(pq));

	return pq->tail->data;
}


//返回队列中存储数据的个数
int QueueSize(Queue* pq)
{
	int n = 0;
	QueueNode* cur = pq->head;
	while (cur)
	{
		n++;
		cur = cur->next;
	}

	return n;
}

队列头文件部分

#pragma once

#include 
#include 
#include 
#include 

typedef int QDataType;

typedef struct QueueNode
{
	struct QueueNode* next;
	QDataType data;
}QueueNode;

typedef struct Queue
{
	QueueNode* head;
	QueueNode* tail;
	// size_t _size;
}Queue;

//void QueueInit(QueueNode** pphead, QueueNode** pptail);
void QueueInit(Queue* pq);
void QueueDestroy(Queue* pq);
void QueuePush(Queue* pq, QDataType x);
void QueuePop(Queue* pq);
QDataType QueueFront(Queue* pq);
QDataType QueueBack(Queue* pq);
int QueueSize(Queue* pq);
bool QueueEmpty(Queue* pq);

测试部分

#define  _CRT_SECURE_NO_WARNINGS 1

#include"Stack.h"
#include"Queue.h"

void TestStack1()
{
	ST st;
	StackInit(&st);

	StackPush(&st, 1);
	StackPush(&st, 2);
	StackPush(&st, 3);
	StackPush(&st, 4);

	StackPop(&st);
	StackPop(&st);
	StackPop(&st);
	printf("%d", StackTop(&st));

	StackDestroy(&st);
}

void TestStack2()
{
	ST st;
	StackInit(&st);

	StackPush(&st, 1);
	StackPush(&st, 2);
	StackPush(&st, 3);
	StackPush(&st, 4);

	printf("%d ", StackTop(&st));
	StackPop(&st);
	printf("%d ", StackTop(&st));
	StackPop(&st);

	StackPush(&st, 5);
	StackPush(&st, 6);


	while (!StackEmpty(&st))
	{
		printf("%d ", StackTop(&st));
		StackPop(&st);
	}

	StackDestroy(&st);
}

void TestQueue1()
{
	Queue q;
	QueueInit(&q);
	QueuePush(&q, 1);
	QueuePush(&q, 2);
	QueuePush(&q, 3);
	QueuePush(&q, 4);

	QueuePop(&q);
	QueuePop(&q);
	//QueuePop(&q);
	//QueuePop(&q);
	//QueuePop(&q);

	printf("%d\n", QueueFront(&q));
	printf("%d\n", QueueBack(&q));

	QueuePush(&q, 10);
	QueuePush(&q, 20);

	QueueDestroy(&q);
}

void TestQueue2()
{
	Queue q;
	QueueInit(&q);
	QueuePush(&q, 1);
	QueuePush(&q, 2);
	QDataType front = QueueFront(&q);
	printf("%d ", front);
	QueuePop(&q);

	QueuePush(&q, 3);
	QueuePush(&q, 4);

	while (!QueueEmpty(&q))
	{
		QDataType front = QueueFront(&q);
		printf("%d ", front);
		QueuePop(&q);
	}
	printf("\n");
}


int main()
{
	//TestStack1();
	//TestStack2();
	//TestQueue1();
	//TestQueue2();
	return 0;
}