嵌入式数据结构（栈和队列的应用）

嵌入式自学第十天

1、
2、
test.c

#include 
#include "linkqueue.h"
#include "sqstack.h"

int check(linkqueue * lq);

int main(int argc, const char *argv[])
{
	linkqueue *lq;
	sqstack *s_hour, *s_five, *s_min;
	int value;
	int i, min = 0;

	if ((lq = queue_create()) == NULL) {
		return -1;
	}

	for (i = 1; i <= 27; i++) {
		enqueue(lq, i);
	}

	if ((s_hour = stack_create(11)) == NULL) {
		return -1;
	}

	if ((s_five = stack_create(11)) == NULL) {
		return -1;
	}

	if ((s_min = stack_create(4)) == NULL) {
		return -1;
	}

	while (1) {
		min++;
		if (!queue_empty(lq)) {
			value = dequeue(lq);
			if (!stack_full(s_min)) {
				stack_push(s_min, value);
			} else {
				while (!stack_empty(s_min)) {
					enqueue(lq, stack_pop(s_min));
				}
				if (!stack_full(s_five)) {
					stack_push(s_five, value);
				} else {
					while (!stack_empty(s_five)) {
						enqueue(lq, stack_pop(s_five));
					}
					if (!stack_full(s_hour)) {
						stack_push(s_hour, value);
					} else {
						while (!stack_empty(s_hour)) {
							enqueue(lq, stack_pop(s_hour));
						}
						enqueue(lq, value);
						//0:0
						if (check(lq) == 1) {
							break;
						}
					}
				}

			}
		}
	}
	printf("total:%d\n", min);

	printf("dequeue:");
	while (!queue_empty(lq)) 
		printf("%d ", dequeue(lq));
	
	puts("");

	return 0;
}

int check(linkqueue * lq) {
	linklist p;

	if (lq == NULL) {
		printf("lq is NULL\n");
		return -1;
	}

	p = lq->front->next;

	while (p && p->next) {
		if (p->data < p->next->data) {
			p = p->next;
		} else {
			return 0;
		}
	}
	return 1;
}

sqstak.c

#include 
#include 
#include 
#include "sqstack.h"

sqstack * stack_create(int len) {
	sqstack * s;

	if ((s =(sqstack *)malloc(sizeof(sqstack))) == NULL) {
		printf("malloc sqstack failed\n");
		return NULL;
	}

	if ((s->data = (data_t *)malloc(len * sizeof(data_t)))==NULL) {
		printf("malloc data failed\n");
		free(s);
		return NULL;
	}

	memset(s->data, 0, len*sizeof(data_t));
	s->maxlen = len;
	s->top = -1;

	return s;
}

int stack_push(sqstack * s, data_t value) {
	if (s == NULL) {
		printf("s is NULL\n");
		return -1;
	}

	if (s->top == s->maxlen-1) {
		printf("stack is full\n");
		return -1;
	}

	s->top++;
	s->data[s->top] = value;

	return 0;
}

/*
 *@ret 1-empty
 * */
int stack_empty(sqstack *s) {
	if (s == NULL) {
		printf("s is NULL\n");
		return -1;
	}
	return (s->top == -1 ? 1 : 0);
}

/*
 * @ret 1-full
 * */
int stack_full(sqstack *s) {
	if (s == NULL) {
		printf("s is NULL\n");
		return -1;
	}
	return  (s->top == s->maxlen-1 ? 1 : 0);
}

data_t stack_pop(sqstack *s) {
	s->top--;
	return (s->data[s->top+1]);
}

data_t stack_top(sqstack *s) {
	return (s->data[s->top]);
}

int stack_clear(sqstack *s) {
	if (s == NULL) {
		printf("s is NULL\n");
		return -1;
	}
	
	s->top = -1;
	return 0;
}

int stack_free(sqstack *s) {
	if (s == NULL) {
		printf("s is NULL\n");
		return -1;
	}
	
	if (s->data != NULL) 
		free(s->data);
	free(s);

	return 0;
}

sqstak.h

typedef int data_t;

typedef struct {
	data_t *data;
	int maxlen;
	int top;
}sqstack;

sqstack * stack_create(int len);
int stack_push(sqstack * s, data_t value);
int stack_empty(sqstack *s);
int stack_full(sqstack *s);
data_t stack_pop(sqstack *s);
data_t stack_top(sqstack *s);
int stack_clear(sqstack *s);
int stack_free(sqstack *s);

linkqueue.c

#include 
#include 
#include "linkqueue.h"

linkqueue * queue_create() {
	linkqueue *lq;

	if ((lq = (linkqueue *)malloc(sizeof(linkqueue))) == NULL) {
		printf("malloc linkqueue failed\n");
		return NULL;
	}

	lq->front = lq->rear = (linklist)malloc(sizeof(listnode));
	if (lq->front == NULL) {
		printf("malloc node failed\n");
		return NULL;
	}
	lq->front->data = 0;
	lq->front->next = NULL;

	return lq;
}

int enqueue(linkqueue *lq, datatype x) {
	linklist p;

	if (lq == NULL) {
		printf("lq is NULL\n");
		return -1;
	}

	if ((p = (linklist)malloc(sizeof(listnode))) == NULL) {
		printf("malloc node failed\n");
		return -1;
	}
	p->data = x;
	p->next = NULL;

	lq->rear->next = p;
	lq->rear = p;

	return 0;
}

datatype dequeue(linkqueue *lq) {
	linklist p;

	if (lq == NULL) {
		printf("lq is NULL\n");
		return -1;
	}

	p = lq->front;
	lq->front = p->next;
	free(p);
	p = NULL;

	return (lq->front->data);
}

int queue_empty(linkqueue *lq) {
	if (lq == NULL) {
		printf("lq is NULL\n");
		return -1;
	}

	return (lq->front == lq->rear ? 1 : 0);
}

int queue_clear(linkqueue *lq) {
	linklist p;

	if (lq == NULL) {
		printf("lq is NULL\n");
		return -1;
	}

	while (lq->front->next) {
		p = lq->front;
		lq->front = p->next;
		printf("clear free:%d\n", p->data);
		free(p);
		p = NULL;
	}
	return 0;
}

linkqueue * queue_free(linkqueue *lq) {
	linklist p;

	if (lq == NULL) {
		printf("lq is NULL\n");
		return NULL;
	}

	while (lq->front) {
		p = lq->front;
		lq->front = p->next;
		printf("free:%d\n", p->data);
		free(p);
	}

	free(lq);
	lq = NULL;

	return NULL;
}

linkqueue.h

typedef int datatype;

typedef struct node {
	datatype data;
	struct node *next;
}listnode , *linklist;

typedef struct {
	linklist front;
	linklist rear;
}linkqueue;

linkqueue * queue_create();
int enqueue(linkqueue *lq, datatype x);
datatype dequeue(linkqueue *lq);
int queue_empty(linkqueue *lq);
int queue_clear(linkqueue *lq);
linkqueue * queue_free(linkqueue *lq);