棧的基本操作

棧的儲存結構有兩種：一種是線性棧，一種是鏈式棧。下面分別是這兩種儲存結構的實現。

線性棧：

#define STACK_INIT_SIZE 10
#define STACK_REALLOCATION 2

typedef int ElemType;

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

void InitSqStack(SqStack *S)
{
	S->base = (ElemType*)malloc(STACK_INIT_SIZE*sizeof(ElemType));
	if (!S->base)
		exit(1);
	S->top = 0;
	S->stacklength = STACK_INIT_SIZE;
}

void Push_SqStack(SqStack *S,ElemType e)
{
	if (S->top == S->stacklength){
		S->base = (ElemType*)realloc(S->base,(S->stacklength

+STACK_REALLOCATION)*sizeof(ElemType));
		if (!S->base)
			exit(1);
		S->stacklength += STACK_REALLOCATION;
	}
	S->base[S->top] = e;
	++S->top;
}

int Pop_SqStack(SqStack *S, ElemType *e)
{
	if (S->top == 0)
		return 0;
	--S->top;
	*e = S->base[S->top];
	return 1;
}

int GetTopElem_SqStack(SqStack *S, ElemType *e)
{
	if (S->top == 0)
		return 0;
	*e = S->base[S->top-1];
	return 1;
}

int isSqStackEmpty(SqStack S)
{
	if (S.top == 0)
		return 1;
	else
		return 0;
}

void SqStack_test()
{
	SqStack S;
	InitSqStack(&S);
	ElemType e;
	printf("Please input some numbers(Ctrl + Z to end).\n");
	while (scanf("%d", &e) != EOF)
		Push_SqStack(&S,e);
	printf("The out stack sequence is:\n");
	while (!isSqStackEmpty(S)){
		Pop_SqStack(&S,&e);
		printf("%d ",e);
	}
	printf("\n");
}

int main()
{
	SqStack_test();
	return 0;
}

鏈式棧：

#include <stdio.h>
#include <stdlib.h>

#define STACK_INIT_SIZE 10
#define STACK_REALLOCATION 2

typedef int ElemType;

typedef struct LinkStack
{
	ElemType data;
	struct LinkStack *next;
}StackNode,*StackPNode;

StackPNode InitLinkStack()
{
	StackPNode head = (StackPNode)malloc(sizeof(StackNode));
	if (!head)
		exit(1);
	head->next = NULL;
	head->data = 0;
	return head;
}

void Push_LinkStack(StackPNode head, ElemType e)
{
	StackPNode node = (StackPNode)malloc(sizeof(StackNode));
	if (!node)
		exit(1);
	node->data = e;
	node->next = NULL;
	node->next = head->next;
	head->next = node;
}

int Pop_LinkStack(StackPNode head, ElemType *e)
{
	StackPNode p;
	if (!head->next)
		return 0;
	//StackPNode p;
	//StackPNode p;
	//struct LinkStack *p;
	p= head->next;
	
	*e=p->data;
	head->next = p->next;
	free(p);
	return 1;
}

int isLinkStackEmpty(StackPNode head)
{
	if (head->next)
		return 0;
	else
		return 1;
}

int getTopElem_LinkStack(StackPNode head,ElemType *e)
{
	if (head->next)
		return 0;
	*e = head->next->data;
	return 1;
}

void LinkStack_test()
{
	StackPNode head = InitLinkStack();
	ElemType e;
	printf("Please input some numbers(Ctrl + Z to end).\n");
	while (scanf("%d", &e) != EOF)
		Push_LinkStack(head,e);
	printf("The out stack sequence is:\n");
	while (!isLinkStackEmpty(head)){
		Pop_LinkStack(head, &e);
		printf("%d ", e);
	}
	printf("\n");
}

int main()
{
	LinkQueueTest();
	return 0;
}