顺序队列C语言实现

#include "stdio.h"    
#include "stdlib.h"   

#include "math.h"  
#include "time.h"
#define maxlen 20
typedef struct
{
	int data[maxlen];
	int front;    	
	int rear;		
}sqQueue;

int initqueue(sqQueue* Q)
{
	Q->front = 0;
	Q->rear = 0;
	return 1;
}

int insert(sqQueue* Q, int value)
{
	if ((Q->rear == maxlen-1 && Q->front == 0) || (Q->front - Q->rear == 1))
	{
		printf("队列满n");
		return 0;
	}
	Q->data[Q->rear] = value;
	if (Q->rear == maxlen - 1)
	{
		Q->rear = 0;
	}
	else
	{
		Q->rear++;

	}
	
	return 1;
}

int delet(sqQueue* Q)
{
	if (Q->front == Q->rear)
	{
		printf("队列空n");
		return 0;
	}
	if (Q->front == maxlen-1)
	{
		Q->front = 0;
	}
	Q->front++;
	return 1;
}

int seeQueue(sqQueue Q)
{
	int i, j;
	i = Q.front;
	j = Q.rear;
	if (i == j)
	{
		printf("队列空n");
		return 0;
	}
	while (i!=j)
	{
		if (i == maxlen)
		{
			i = 0;
		}
		printf("%d ", Q.data[i]);
		i++;
	}
	printf("n");
	return 1;

}

int getlength(sqQueue Q)
{
	int i, j;
	i = Q.front;
	j = Q.rear;
	if (j > i)
	{
		return j - i;
	}
	else
	{
		return maxlen - (i - j);
	}
}

int main()
{
	sqQueue Q;
	initqueue(&Q);
	for (int i = 0; i < 19; i++)
	{
		insert(&Q, i);
	}
	seeQueue(Q);
	printf("长度为：%dn", getlength(Q));
	

	for (int j = 0; j < 17; j++)
	{
		delet(&Q);
	}
	seeQueue(Q);
	printf("长度为：%dn", getlength(Q));
	insert(&Q, 20);
	insert(&Q, 220);
	
	delet(&Q);
	seeQueue(Q);
	printf("长度为：%dn", getlength(Q));
}