队列的 基本操作

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

//函数结果状态代码
# define  TURE  1
# define  FALSE 0
# define  OK  1
# define  ERROR 0
# define  OVERFLOW -2
# define  maxqsize 100

typedef int status;
typedef int qelemtype;
typedef struct{
   qelemtype *base;
   int front;
   int rear;
}sqqueue;

//----------循环队列的基本操作的算法描述--------
status initqueue(sqqueue &Q){
  //构造一个空队列Q
  Q.base=(qelemtype*)malloc(maxqsize*sizeof(qelemtype));
  if(!Q.base)  return ERROR;
  Q.front=Q.rear=0;
  return OK;
}

int queuelength(sqqueue Q){
  //返回Q的元素个数，即对列的长度
  return (Q.rear-Q.front+maxqsize)%maxqsize;
}

status enqueue(sqqueue &Q,qelemtype e){
  //插入元素e为Q的新的队尾元素
  if((Q.rear+1)%maxqsize==Q.front) return ERROR; //队列满
  Q.base[Q.rear]=e;
  Q.rear=(Q.rear+1)%maxqsize;
  return OK;
}

status dequeue(sqqueue &Q,qelemtype &e){
  //若队列不空,则删除Q的队头元素,用e返回其值,并返回OK
  //否则返回ERROR
  if(Q.front==Q.rear) return ERROR;
  e=Q.base[Q.front];
  Q.front=(Q.front+1)%maxqsize;
  return OK;
}

 int main()
 {
  //测试基本操作
  int i,e;
  sqqueue Q;
  initqueue(Q);
  printf("\n");
  for(i=1;i<=10;i++)
    {
     e=i;
     enqueue(Q,e);
    }

  printf("the Length of queue is :%d\n",queuelength(Q));

  for(i=1;i<=10;i++)
    {
     dequeue(Q,e);
     printf(" %d",e);
    }
 }