本文主要是介绍（数据结构）循环队列的入队出队算法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
#include<stdio.h>
#include<stdlib.h>
#define MAXSIZE 1024
typedef struct SequenQueue
{int data[MAXSIZE]; //定义顺序队列为一维数组int front; //头指针int rear; //尾指针
}SequenQuene;
//循环队列的初始化
SequenQuene* Init_sequenQuene()
{SequenQuene* Q;Q = (SequenQuene*)malloc(sizeof(SequenQuene));if (Q == NULL){printf("申请循环队列空间失败，程序结束\n");return NULL;}else{Q->front = 0;Q->rear = 0;}return Q;
}
//判断队列为空
int SequenQuene_Empty(SequenQuene* Q)
{if (Q->front == Q->rear){printf("栈为空\n");return 1; //栈空}else{return 0; //栈不为空}
}
//判断队列为满
int SequenQuene_Full(SequenQuene* Q)
{if ((Q->rear + 1) % MAXSIZE == Q->front) //栈的尾指针的下一位取余如果等于头指针，则判断栈满{return 1; //栈满}else{return 0; //栈不为满}
}
//求循环队列的长度
int SequenQuene_Length(SequenQuene* Q)
{return (Q->rear - Q->front + MAXSIZE) % MAXSIZE; //尾指针-头指针得到它们的较短相隔的空白内存距离(负数),//加上整个队列的内存大小再取余后，得到的是有数据的内存空间距离
}
//入队
int Enter_SequenQuene(SequenQuene* Q, int x)
{if (SequenQuene_Full(Q)){return 0;}Q->data[Q->rear] = x; //尾指针处赋值Q->rear = (Q->rear + 1) % MAXSIZE; //尾指针向前一位return 1;
}
//出队
int Delete_SequenQuene(SequenQuene* Q, int* x)
{if (SequenQuene_Empty(Q)) //判断队列是否为空{return 0;}else{*x = Q->data[Q->front]; //将对头元素赋值给xQ->front = (Q->front + 1) % MAXSIZE; //将队头向后移一位}return 1;
}
//取队头数据元素
int GetFront_SequenQuene(SequenQuene* Q, int* x)
{if (SequenQuene_Empty(Q)) //判断队列是否为空{return 0;}else{*x = Q->data[Q->front]; //将对头元素赋值给xreturn 1;}
}
int main()
{SequenQuene* Q;Q = Init_sequenQuene();while (1){printf("输入1为入队，输入0为退队\n");int ret;printf("请输入选项\n");scanf("%d", &ret);if (ret == 1){int x;printf("请输入需要入队的值\n");scanf("%d", &x);Enter_SequenQuene(Q, x);continue;}else if (ret == 0){int y = 0;Delete_SequenQuene(Q, &y);printf("出队的值为：\n");printf("%d \n", y);continue;}else{printf("选项输入错误\n");}}return 0;
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