栈 c实现

栈的数组实现

stack.h

#ifndef _STACK_
#define _STACK_

#define SIZE 100

typedef int data_t;

typedef struct head{
    data_t data[SIZE];
    int top;
}stack_t;

stack_t *stack_create();

int stack_is_empty(stack_t *head);
int stack_is_full(stack_t *head);
void stack_clear(stack_t *head);

int stack_push(stack_t *head, data_t data);
data_t stack_pop(stack_t *head);
data_t stack_get_top(stack_t *head);

void stack_show(stack_t *head);
void stack_destory(stack_t **head);

#endif

stack.c

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

#include "sqstack.h"

stack_t *stack_create()
{
    stack_t *head = (stack_t *)malloc(sizeof(stack_t));
    if (head == NULL) {
        printf("malloc failed!\n");
        return NULL;
    }
    bzero(head, sizeof(stack_t));

    head->top = -1;

    return head;
}

int stack_is_empty(stack_t *head)
{
    return head->top == -1;
}

int stack_is_full(stack_t *head)
{
    return head->top == SIZE - 1;
}

void stack_clear(stack_t *head)
{
    head->top = -1;
}

int stack_push(stack_t *head, data_t data)
{
    if (stack_is_full(head)) {
        printf("stack is full!\n");
        return -1;
    }

    head->data[head->top+1] = data;
    head->top++;

    return 0;
}

data_t stack_pop(stack_t *head)
{
    if (stack_is_empty(head)) {
        printf("stack is empty!\n");
        return -1;
    }

    data_t data = head->data[head->top];
    head->top--;

    return data;
}

data_t stack_get_top(stack_t *head)
{
    if (stack_is_empty(head)) {
        printf("stack is empty!\n");
        return -1;
    }
    
    return head->data[head->top];
}

void stack_show(stack_t *head)
{
    int i;
    for (i = head->top; i >= 0; i--) {
        printf("%d, ", head->data[i]);
    }
    printf("\n");
}

void stack_destory(stack_t **head)
{
    free(*head);
    *head = NULL;
}

main.c

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

#include "sqstack.h"

int main()
{
    stack_t *head = stack_create();

    int n = 10;
    while (n--) {
        stack_push(head, n+1);
    }
    stack_show(head);

    int i;
    for (i = 0; i < 10; i++) {
        printf("%d, ", stack_get_top(head));
        printf("%d\n", stack_pop(head));
    }
    stack_show(head);

    stack_destory(&head);

    return 0;
}

 栈的链表实现

lstack.h

#ifndef _STACK_
#define _STACK_

typedef int data_t;

typedef struct node{
    data_t data;
    struct node *next;
}NODE;

NODE *stack_create();

int stack_is_empty(NODE *head);
int stack_is_full(NODE *head);

int stack_length(NODE *head);
void stack_clear(NODE *head);

int stack_push(NODE *head, data_t data);
data_t stack_pop(NODE *head);
data_t stack_get_top(NODE *head);

void stack_show(NODE *head);
void stack_destory(NODE **head);

#endif

lstack.c

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

#include "lstack.h"

NODE *stack_create()
{
    NODE *head = (NODE *)malloc(sizeof(NODE));
    if (NULL == head) {
        printf("malloc failed!\n");
        return NULL;
    }
    bzero(head, sizeof(NODE));

    head->data = -1;
    head->next = NULL;

    return head;
}

int stack_is_empty(NODE *head)
{
    return head->next == NULL;
}

int stack_is_full(NODE *head)
{
    return 0;
}

int stack_length(NODE *head)
{
    NODE *p = head->next;
    int len = 0;

    while (NULL != p) {
        len++;
        p = p->next;
    }

    return len;
}

void stack_clear(NODE *head)
{
    NODE *p = head->next;
    NODE *q = NULL;

    while (NULL != p)  {
        q = p->next;
        free(p);
        p = q;
    }

    head->next = NULL;
}

int stack_push(NODE *head, data_t data)
{
    NODE *p = head;
    NODE *q = (NODE *)malloc(sizeof(NODE));
    if (NULL == q) {
        printf("malloc failed!\n");
        return -1;
    }
    q->data = data;
    q->next = NULL;

    q->next = p->next;
    p->next = q;

    return 0;
}

data_t stack_pop(NODE *head)
{
    if (stack_is_empty(head)) {
        printf("list is empty!\n");
        return -1;
    }

    data_t data = head->next->data;

    NODE *p = head;
    NODE *q = head->next;
    p->next = q->next;
    free(q);
    q = NULL;
    
    return data;
}

data_t stack_get_top(NODE *head)
{
    if (stack_is_empty(head)) {
        printf("list is empty!\n");
        return -1;
    }
    
    return head->next->data;
}

void stack_show(NODE *head)
{
    NODE *p = head->next;

    while (NULL != p) {
        printf("%d, ", p->data);
        p = p->next;
    }
    printf("\n");
}

void stack_destory(NODE **head)
{
    stack_clear(*head);

    free(*head);
    *head = NULL;
}

main.c

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

#include "lstack.h"

int main()
{
    NODE *head = stack_create();

    if (NULL == head) {
        printf("create failed!\n");
        return -1;
    }

    int n = 10;
    while (n--) {
        if (-1 == stack_push(head, n+1)) {
            printf("insert failed!\n");
            break;
        }
    }
    
    stack_show(head);

    int i;
    for (i = 0; i < 10; i++) {
        printf("%d, ", stack_get_top(head));
        printf("%d\n", stack_pop(head));
    }

    stack_destory(&head);

    return 0;
}