队列
队列的基本操作有初始化队列,判队列是否为空,入队,出队
栈可分为两种存储结构:顺序队和链队。
顺序队
/* 顺序队结构 */
typedef struct
{
ElemType data[MAXSIZE];
int front;
int rear;
} SqQueue;
顺序队四个要素:
(1)队空条件:qu.rear == qu.front;
(2)队满条件: (qu.rear + 1) % MAXSIZE == qu.front;
(3)进队条件: qu.rear = (qu.rear + 1) % MAXSIZE; qu.data[qu.rear] = data;
(4)出队条件: qu.front = (qu.front + 1) % MAXSIZE; data = qu.data[qu.front];
顺序队基本操作
#include "stdafx.h" #include <stdlib.h> #define MAXSIZE 10 typedef int ElemType; /* 顺序栈结构 */ typedef struct { ElemType data[MAXSIZE]; int front; int rear; } SqQueue; void InitStack(SqQueue &qu) { qu.front = qu.rear = 0; } bool IsEmpty(SqQueue &qu) { return (qu.front == qu.rear); } int InQueue(SqQueue &qu, ElemType data) { if ((qu.rear + 1) % MAXSIZE == qu.front) { return -1; } qu.data[qu.rear] = data; qu.rear = (qu.rear+1) % MAXSIZE; return 0; } int OutQueue(SqQueue &qu, ElemType &data) { if (qu.front == qu.rear) { return -1; } qu.front = (qu.front + 1) % MAXSIZE; data = qu.data[qu.front]; return 0; } void PrintQueue(SqQueue &qu) { int i = 0; if (qu.front == qu.rear) return; i = qu.front; while (i != qu.rear) { printf("%d\t", qu.data[i]); i = (i+1)%MAXSIZE; } printf("\r\n"); return; } int _tmain(int argc, _TCHAR* argv[]) { ElemType array[] = {1, 2, 3, 4, 5, 6, 7, 8, 9}; int i = 0; int data = 0; SqQueue queue = { 0 }; InitStack(queue); for (i = 0; i < sizeof(array)/sizeof(ElemType); i++) { InQueue(queue, array[i]); } PrintQueue(queue); OutQueue(queue, data); OutQueue(queue, data); PrintQueue(queue); InQueue(queue, 11); InQueue(queue, 12); PrintQueue(queue); return 0; }