【数据结构】顺序栈与链栈

栈的特点是后进先出或先进后出，简称LIFO或FILO，通常top时刻表示栈顶的位置序号，一般空栈时top=-1；入栈栈顶指针加1，s->top++;出栈栈顶指针减1，s->top--

【顺序栈】

定义：

typedef struct
{
int date[MAX];
int top;
} SeqStack,*Stack;

置空栈：

Stack Init_SeqStack()//置空栈
{
   Stack s;
   s=(SeqStack*)malloc(sizeof(SeqStack));
   if(!s)
   {
       printf("空间不足\n");
       return NULL;
   }
   else
   {
       s->top = -1;
       return s;
   }
}

判断是否为空栈：

int Empty_Stack(Stack s)//判断是否空栈
{
   if (s->top == -1)
       return 1;
   else
       return 0;
}

进栈：

int Push_SeqStack(SeqStack* s,int x)//进栈
{
   if (s->top == MAX - 1)
   {
       printf("栈满！");
       return 0;
   }
   else
   {
       s->top++;
       s->date[s->top] = x;
       return 1;
   }
}

出栈：

int Pop_SeqStack(SeqStack* s,int* x)//出栈
{
   if (s->top == -1)
       return 0;
   else
   {
       *x = s->date[s->top];//(上面定义了一个指针，用指针来接受数据)
       s->top--;
       return 1;
   }

}

输出栈中元素：

int printStack(Stack s)//输出
{
   int top = s->top;
   while (top != -1)
       printf("%4d", s->date[top--]);
   printf("\n");
   return 0;
}
int GetTop(Stack s)
{
   int top = s->top;
   return s->date[top];
}

输出栈顶：

int GetTop(Stack s)
{
int top = s->top;
return s->date[top];
}

以下为一个顺序栈，实现栈的入栈、出栈并将其中元素输出功能

#include<stdio.h>
#include<stdlib.h>
#define MAX 100
typedef struct
{
	int date[MAX];
	int top;
} SeqStack,*Stack; //SeqStack*==Stack
Stack Init_SeqStack()//置空栈 
{
	Stack s;
	s=(SeqStack*)malloc(sizeof(SeqStack));
	if(!s)
	{
		printf("空间不足\n");
		return NULL;
	}
	else
	{
		s->top = -1;
		return s;
	}
}
int Empty_Stack(Stack s)//判断是否空栈 
{
	if (s->top == -1)
		return 1;
	else
		return 0;
}
int Push_SeqStack(Stack s,int x)//进栈 
{
	if (s->top == MAX - 1)
	{
		printf("栈满！");
		return 0;
	}
	else
	{
		s->top++;
		s->date[s->top] = x;
		return 1;
	}
}
int Pop_SeqStack(Stack s,int* x)//出栈  
{
	if (s->top == -1)
		return 0;
	else
	{
		*x = s->date[s->top];//(上面定义了一个指针，用指针来接受数据) 
		s->top--;
		return 1;
	}

}
int printStack(Stack s)//输出 
{
	int top = s->top;
	while (top != -1)
		printf("%4d", s->date[top--]);
	printf("\n");
	return 0;
}
int GetTop(Stack s)
{
	
	int top = s->top;
	return s->date[top];
}
int main()
{
	Stack s;
	int x;
	s=Init_SeqStack();
	Empty_Stack(s);
	printf("请输入入栈数字：\n");
	scanf("%d", &x);
	while (x != 0)
	{
		Push_SeqStack(s,x);
		printf("请输入入栈数字：\n");
		scanf("%d", &x);
	}
	printStack(s);
	printf("栈顶：%d\n",GetTop(s));
	printf("出栈测试：");
	Pop_SeqStack(s,&x);//这个函数上面x定义的为指针，所以要加取地址符 
	printStack(s);
	return 0;
}

【链栈】

定义：

typedef struct node
{
int date;
struct node* next;
}StackNode, * LinkStack;

实现链栈的入栈、出栈并将其中元素输出功能

#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
	int date;
	struct node* next;
}StackNode, * LinkStack;
void Init_LinkStack(LinkStack &p)//初始化 
{
	p = (LinkStack)malloc(sizeof(StackNode));
	p->date = 0;
	p->next = NULL;
}
int Empty_LinkStack(LinkStack top)
{
	if (top == NULL)
		return 1;
	else
		return 0;
}
void Push_LinkStack(LinkStack &top, int x)//入栈 
{
	LinkStack s;
	s = (LinkStack)malloc(sizeof(StackNode));
	s->date = x;
	s->next = top->next;
	top->next = s;
}
LinkStack Pop_LinkStack(LinkStack &top, int &x)//出栈 
{
	LinkStack p;
	if (top->next == NULL)
		return NULL;
	else
	{
		p = top->next;
		x = p->date;
		top->next = p->next;
		free(p);
		return top;
	}
}
int GetTop(LinkStack s, int x)//栈顶
{
	if (s->next == NULL)
		return NULL;
	x = s->next->date;
	return x;
}

void printStack(LinkStack top)//输出 
{
	while (top != NULL)
	{
		printf("%4d", top->date);
		top = top->next;
	}
	printf("\n");
}
int main()
{
	LinkStack top;
	int x=0;
	Init_LinkStack(top);
	Empty_LinkStack(top);
	printf("请输入入栈元素：\n");
	scanf("%d", &x);
	while (x != 0)
	{
		Push_LinkStack(top, x);
		printf("请输入入栈元素：\n");
		scanf("%d", &x);
	}
	printStack(top);
	printf("栈顶为：%d\n", GetTop(top, x));
	printf("出栈测试：\n");
	Pop_LinkStack(top, x);
	if (top != NULL)
	{
		printStack(top);
	}
	else
		printf("栈空，无法输出！");
	return 0;
}

注意：链栈中的top是我所定义的一个指针，与顺序栈不同

求助：在链栈的代码中，输出栈中元素时，一直会在输出栈中元素的前端出现一个0（我在初始化函数中，将p->date赋初值为0），如何修改代码