zoukankan      html  css  js  c++  java
  • 顺序循环队列的基本操作

    #include
    #include
    #define OK 1
    #define ERROR 0
    typedef int Status; // Status是函数的类型,其值是函数结果状态代码,如OK等
    typedef int QElemType;
    #define MAXQSIZE 100 // 最大队列长度(对于循环队列,最大队列长度要减1)
     
    typedef struct
    {
        QElemType *base; // 初始化的动态分配存储空间
        int front; // 头指针,若队列不空,指向队列头元素
        int rear; // 尾指针,若队列不空,指向队列尾元素的下一个位置
    } SqQueue;
     
    //创建队列
    Status InitQueue(SqQueue &Q)
    {
    // 构造一个空队列Q,该队列预定义大小为MAXQSIZE
        Q.base=(QElemType *)malloc(sizeof(SqQueue)*MAXQSIZE);
        if(Q.base==NULL)return ERROR;
        Q.front=Q.rear=0;
        return OK;
    }
     
    //入队
    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;    //队满则不插入
        Q.base[Q.rear]=e;
        Q.rear=(Q.rear+1)%MAXQSIZE;
        return OK;
     
    }
     
    //出队
    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;
    }
     
    //取对头元素
    Status GetHead(SqQueue Q, QElemType &e)
    {
    // 若队列不空,则用e返回队头元素,并返回OK,否则返回ERROR
        if(Q.front==Q.rear)return OK;
        e=Q.base[Q.front];
        return OK;
    }
     
    //计算队列的元素个数
    int QueueLength(SqQueue Q)
    {
        return (Q.rear-Q.front+MAXQSIZE)%MAXQSIZE;
     
    }
     
    //判断队列是否为空
    Status QueueTraverse(SqQueue Q)
    {
    // 若队列不空,则从队头到队尾依次输出各个队列元素,并返回OK;否则返回ERROR.
        int i;
        i=Q.front;
        if(i==Q.rear)printf("The Queue is Empty!");  //请填空
        else
        {
            printf("The Queue is: ");
            while(i!=Q.rear)     //请填空
            {
                printf("%d ",Q.base[i]);   //请填空
                i = (i+1)%MAXQSIZE;   //请填空
            }
        }
        printf(" ");
        return OK;
    }
     
    //主函数
    int main()
    {
        int a;
        SqQueue S;
        QElemType x, e;
        if(InitQueue(S))    // 判断顺序表是否创建成功,请填空
        {
            printf("A Queue Has Created. ");
        }
        while(1)
        {
            printf("1:Enter 2:Delete 3:Get the Front 4:Return the Length of the Queue 5:Load the Queue 0:Exit Please choose: ");
            scanf("%d",&a);
            switch(a)
            {
            case 1:
                scanf("%d", &x);
                if(!EnQueue(S,x)) printf("Enter Error! "); // 判断入队是否合法,请填空
                else printf("The Element %d is Successfully Entered! ", x);
                break;
            case 2:
                if(!DeQueue(S,e)) printf("Delete Error! "); // 判断出队是否合法,请填空
                else printf("The Element %d is Successfully Deleted! ", e);
                break;
            case 3:
                if(!GetHead(S,e))printf("Get Head Error! "); // 判断Get Head是否合法,请填空
                else printf("The Head of the Queue is %d! ", e);
                break;
            case 4:
                printf("The Length of the Queue is %d! ",QueueLength(S));  //请填空
                break;
            case 5:
                QueueTraverse(S); //请填空
                break;
            case 0:
                return 1;
            }
        }
    }
  • 相关阅读:
    GDUFE ACM-1050
    hdu-2020
    hdu-2055
    hdu-2734
    GDUFE ACM-1145
    GDUFE ACM-1127
    GDUFE ACM-1126
    GDUFE ACM-1125
    GDUFE ACM-1124
    GDUFE ACM-1123
  • 原文地址:https://www.cnblogs.com/yujon/p/5467617.html
Copyright © 2011-2022 走看看