利用佇列的基本功能輸出楊輝三角形：

• 實現方案：

#include "SequenceQueue.h"

int main()
{
	int N, num, i;
	Queue *que1 = NULL, *que2 = NULL, *tmp = NULL;
	
	if(QueueInit(&que1) != SUCCESS || QueueInit(&que2) != SUCCESS)
	{
		printf("Init Error!\n");
		return 0;
	}
	
	printf("Please input:\n");
	scanf("%d", &N);
	
	for(i = 0; i < N; i++)
	{
		if(0 == i)
		{
			Push(que1, 0);
			Push(que1, 1);
			Push(que1, 0);
			num = 1;
			printf("%4d", num);
		}
		else
		{
			Push(que2, 0);
			while(1 != QueueLength(que1))
			{
				num = Pop(que1);
				num = num + Get(que1);
				Push(que2, num);
				printf("%4d ", num);
			}
			Push(que2, 0);
			
			tmp = que1;
			que1 = que2;
			que2 = tmp;
			QueueClear(que2);
		}
		
		printf("\n");
	}
	
	return 0;
}
 

• 標頭檔案：

#ifndef _SEQUENCEQUEUE_H
#define _SEQUENCEQUEUE_H

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

#define SIZE 1024
#define SUCCESS 10000
#define FAILURE 10001
#define TRUE    10002
#define FALSE   10003

typedef struct SequenceQueue
{
	int data[SIZE];
	int front;
	int rear;
}Queue;

int QueueInit(Queue **queue);
int QueueEmpty(Queue *queue);
int Push(Queue *queue, int i);
int Get(Queue *queue);
int QueueLength(Queue *queue);
int Pop(Queue *queue);
int QueueClear(Queue *queue);
int QueueDestory(Queue **queue);

#endif
 

• 功能函式：

#include "SequenceQueue.h"

int QueueInit(Queue **queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	*queue = (Queue *)malloc(sizeof(Queue));
	if(*queue == NULL)
	{
		return FAILURE;
	}
	
	(*queue)->front = 0;
	(*queue)->rear = 0;
	
	return SUCCESS;
}

int QueueEmpty(Queue *queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	if(queue->rear == queue->front)
	{
		return TRUE;
	}
	else
	{
		return FAILURE;
	}
}

int Push(Queue *queue, int i)
 {
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	if((queue->rear+1)%SIZE == queue->front)
	{
		return FAILURE;
	}
	
	queue->data[queue->rear] = i;
	queue->rear++;
	
	return SUCCESS;
 }
 
int Get(Queue *queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	return queue->data[queue->front];
}

int QueueLength(Queue *queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	return (queue->rear-queue->front+SIZE)%SIZE;
}

int Pop(Queue *queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	if(queue->front == queue->rear)
	{
		return FAILURE;
	}
	
	int e = queue->data[queue->front];
	queue->front = (queue->front+1)%SIZE;
	
	return e;
}

int QueueClear(Queue *queue)
{
	if(queue == NULL)
	{
		return FAILURE;
	}
	
	queue->front = queue->rear = 0;
	
	return SUCCESS;
}

int QueueDestory(Queue **queue)
{
	if(queue == NULL || *queue == NULL)
	{
		return FAILURE;
	}
	
	free(*queue);
	
	return SUCCESS;
}