C 代码实现链栈

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

#define MAXSIZE 100

//链栈结点结构
typedef struct LinkStack {
	int val;
	struct LinkStack* next;
}LinkStack;

//打印所有栈中元素
void Print(LinkStack* s) {
	while (s) {
		printf("%d\t", s->val);
		s = s->next;
	}
	printf("\n");
}

//入栈
void Push(LinkStack** s, int v) {
	LinkStack* tmp = (LinkStack*)malloc(sizeof(LinkStack));
	tmp->val = v;
	tmp->next = *s;
	*s = tmp;
}

//出栈
bool Pop(LinkStack** s, int* popVal) {
	if (*s == NULL)
		return false;
	*popVal = (*s)->val;
	LinkStack* tmp = *s;
	*s = (*s)->next;
	free(tmp);
	return true;
}

//取栈顶元素
bool getTop(LinkStack* s, int* v) {
	if (s == NULL)
		return false;
	*v = s->val;
	return true;
}

//判断栈是否为空
bool isEmpty(LinkStack* s) {
	if (s == NULL)
		return true;
	else return false;
}

int main() {
	//初始化一个空栈
	LinkStack* s = (LinkStack*)malloc(sizeof(LinkStack));
	s = NULL;
	//判断栈是否为空
	if (isEmpty(s))
		printf("s is empty.\n");
	else printf("s is not empty.\n");
	//入栈
	Push(&s, 1);
	//打印所有栈中元素
	Print(s);
	//入栈
	Push(&s, 2);
	//打印所有栈中元素
	Print(s);
	//出栈
	int popVal = 0;
	Pop(&s, &popVal);
	//打印所有栈中元素
	Print(s);
	//打印出栈元素
	printf("%d\n", popVal);
	//取栈顶元素
	int topVal = 0;
	getTop(s, &topVal);
	//打印栈顶元素
	printf("%d\n", topVal);
	//打印所有栈中元素
	Print(s);
	return 0;
}