链式栈的基本操作与实现

1：头文件：SqStack.h

#include<stdio.h>
#include<stdlib.h>
#define ElemType int
#define STACK_SIZE 100
#define ADD_SIZE 10

typedef struct SqStack
{
	ElemType *base;
	ElemType *top;
	int stacksize;
}SqStack;

bool Isempty(SqStack *s); //栈是否为空
bool IsFull(SqStack *s);  //判栈是否已满
void InitStack(SqStack *s);  //初始化栈
void PushStack(SqStack *s,ElemType x);  //入栈
void PopStack(SqStack *s,ElemType *x);  //出栈
void ShowStack(SqStack *s); //显示栈
void GetTop(SqStack *s,ElemType *x);//获取栈顶数据
void ClearStack(SqStack *s);  //清理栈
void DestoryStack(SqStack *s); //摧毁栈
void Show();     //显示菜单

2:功能实现文件SqStack.cpp

#include"SqStack.h"

void Show()
{
	printf("***************************************\n");
	printf("* [1]:入栈            [2]:出栈        *\n");
	printf("* [3]:显示栈          [4]:获取栈顶数据*\n");
	printf("* [5]:摧毁栈          [6]:清理栈      *\n");
	printf("* [0]:结束程序                        *\n");
	printf("***************************************\n");
	printf("请选择：");
}

void InitStack(SqStack *s)
{
	s->base=(ElemType*)malloc(STACK_SIZE*sizeof(ElemType));
	if(s->base==NULL)
	{
		printf("开辟空间失败\n");
		return ;
	}
	s->top=s->base;
	s->stacksize=STACK_SIZE;
}

bool IsFull(SqStack *s)
{
	return s->top-s->base>=s->stacksize;
}

bool Isempty(SqStack *s)
{
	return s->base==s->top;
}
void PushStack(SqStack *s,ElemType x)
{
	if(IsFull(s))
	{
		s->base=(ElemType*)realloc(s->base,(s->stacksize+ADD_SIZE)*sizeof(ElemType));

		if(s->base==NULL)
		{
			printf("增加空间失败\n");
			return;
		}
		s->top=s->base+s->stacksize;
		s->stacksize+=ADD_SIZE;
	}
	*s->top=x;
	s->top++;
}

void PopStack(SqStack *s,ElemType *x)
{
	if(Isempty(s))
	{
		printf("栈为空，不能出栈\n");
		return;
	}
	s->top--;
	*x=*s->top;
}

void GetTop(SqStack *s,ElemType *x)
{
	if(Isempty(s))
	{
		printf("栈为空，不能获取栈数据\n");
		return;
	}
	*x=*(s->top-1);
}

void ClearStack(SqStack *s)
{
	s->base=s->top=NULL;
	s->stacksize=0;
}
void DestoryStack(SqStack *s)
{
	free(s->base);
	ClearStack(s);
}
void ShowStack(SqStack *s)
{
	ElemType *top=s->top;
	while(top!=s->base)
	{
		top--;
		printf("%d ",*top);

	}
	printf("\n");
}

3:主文件main.cpp

#include"SqStack.h"

void main()
{
	SqStack s;
	ElemType x;
	int pos=1;

	InitStack(&s);
	while(pos)
	{
		Show();
		scanf("%d",&pos);
		switch(pos)
		{
		case 1:
			printf("输入数据,以-1结束:");
			while(scanf("%d",&x),x!=-1)
			{
				PushStack(&s,x);
			}
			break;
		case 2:
			PopStack(&s,&x);
	        printf("出栈数据：%d\n",x);
			break;
		case 3:
			ShowStack(&s);
			break;
		case 4:
			GetTop(&s,&x);
			printf("获取栈顶数据：%d\n",x);
			break;
		case 5:
			DestoryStack(&s);
			printf("栈已被摧毁\n");
			break;
		case 6:
			ClearStack(&s);
			printf("栈已被清理\n");
			break;
		default:
			break;
		case 0:	return;
		}
	}
}