C语言链式栈

stack.h

typedef struct Node_s {int data;struct Node_s *pNext;
} Node_t, *pNode_t;typedef struct Stack_s {pNode_t pHead;//栈顶指针，指向了链表的第一个结点int size;//栈的元素个数
} Stack_t, *pStack_t;void init(pStack_t pStack);
void push(pStack_t pStack, int data);
int isEmpty(pStack_t pStack);
void pop(pStack_t pStack);
int top(pStack_t pStack);
int size(pStack_t pStack);

main.c

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "stack.h"
int main() {Stack_t stack;init(&stack);for (int i = 0; i < 5; ++i) {push(&stack, i);printf("top = %d\n", top(&stack));}for (int i = 0; i < 6; ++i) {pop(&stack);printf("pop, top = %d\n", top(&stack));}
}
//初始化
void init(pStack_t pStack) {memset(pStack, 0, sizeof(Stack_t));
}
//压栈
void push(pStack_t pStack, int data) {pNode_t pNew = (pNode_t)calloc(1, sizeof(Node_t));pNew->data = data;//这个链表只有pHead没有pTail，所以不用判断是否为空pNew->pNext = pStack->pHead;pStack->pHead = pNew;++pStack->size;
}
//判空
int isEmpty(pStack_t pStack) {return pStack->size == 0;
}
//弹栈
void pop(pStack_t pStack) {if (isEmpty(pStack)) {fprintf(stderr, "Stack is empty!\n");return -1;}pNode_t pCur = pStack->pHead;pStack->pHead = pCur->pNext;free(pCur);pCur = NULL;--pStack->size;
}
//获取栈顶数据
int top(pStack_t pStack) {if (isEmpty(pStack)) {fprintf(stderr, "Stack is empty!\n");return -1;}return pStack->pHead->data;
}
//获取栈的大小
int size(pStack_t pStack) {return pStack->size;
}