急用，谢谢：用C++编程实现时间片轮转调度算法
用C++编程实现时间片轮转调度算法
那位能够帮助我啊，小妹定当虚心求教，万分感激
谢谢

[解决办法]
// 时间片轮转调度算法
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>

using namespace std;
enum STATUS {RUN,READY,WAIT,FINISH};

struct PCBNode
{
int processID; //进程ID
STATUS status; //进程状态
int priorityNum; //优先数
int reqTime; //总的需要运行时间
int remainTime; //剩下需要运行时间
int arriveTime; //进入就绪队列时间
int startTime; //开始运行时间
int finishTime; //结束运行时间
int totalTime; //周转时间
float weightTotalTime; //带权周转时间
};

struct QueueNode
{
int ID; //进程ID
struct QueueNode * next; //队列中下一个进程指针
};

struct LinkQueue
{
QueueNode *head;//队首
};
void Fcfs(LinkQueue& Q, int& totalTimeSum, int& weightTotalTimeSum,PCBNode * ProcessTable);
bool RR_Run(LinkQueue& Q,QueueNode* q, QueueNode* p, const int Round,int& currentTime,PCBNode * ProcessTable);
//分配时间片给q所指进程,p为刚退出的进程
void RoundRobin(LinkQueue& Q,const int Round, int& totalTimeSum, int& weightTotalTimeSum,PCBNode * ProcessTable);
//时间片轮转调度,调用RR_Run(),时间片大小设为Round
void InitialQueue(LinkQueue& Q,PCBNode * ProcessTable,const int processnum);
//初始化就绪队列
void Input(PCBNode * ProcessTable, const int processnum);
//从input.txt文件输入数据

int main()
{
LinkQueue Q;//就绪队列
Q.head = NULL;
const int processnum = 16;//进程数
const int Round = 1; //时间片大小
int totalTimeSum = 0; //周转时间
int WeightTotalTimeSum = 0;//带权周转时间
PCBNode * ProcessTable=new PCBNode[processnum]; //进程表

Input(ProcessTable, processnum);
InitialQueue(Q, ProcessTable, processnum);
RoundRobin(Q, Round, totalTimeSum,WeightTotalTimeSum,ProcessTable);
cout < < "时间片轮调度的平均周转时间为: " < <totalTimeSum/processnum < <endl;
cout < < "时间片轮调度的平均带权周转时间为: " < <WeightTotalTimeSum/processnum < <endl;

Input(ProcessTable, processnum);
InitialQueue(Q, ProcessTable, processnum);
Fcfs(Q, totalTimeSum,WeightTotalTimeSum,ProcessTable);
cout < < "先来先服务的平均周转时间为: " < <totalTimeSum/processnum < <endl;
cout < < "先来先服务的平均带权周转时间为: " < <WeightTotalTimeSum/processnum < <endl;

delete [] ProcessTable;
return 0;
}

void RoundRobin(LinkQueue& Q,const int Round, int& totalTimeSum, int& weightTotalTimeSum,PCBNode * ProcessTable)
{
totalTimeSum = 0; //总的周转时间
weightTotalTimeSum = 0;//平均周转时间
int currentTime = 0; //当前时间
QueueNode* p;
QueueNode* q;
QueueNode* r;
bool finish = false;//调用RR_Run()后,该进程是否已经做完退出

p = Q.head;
q = p-> next;
while (q != NULL)//从队首开始依次分配时间片
{
do
{
cout < < "********************** " < <endl;
cout < < "在时间片 " < <(currentTime+1)/Round < < "内,活动进程为: " < <q-> ID < <endl;
cout < < "进程 " < <q-> ID < < " 现在需要的时间片为: " < <ProcessTable[q-> ID].remainTime < <endl;
finish = RR_Run(Q, q, p, Round, currentTime, ProcessTable);//分配时间片给q进程
cout < <endl;

if (!finish)//若是进程在本时间片内做完,则跳出do…while循环
{
if (q-> next == NULL)
{
r = Q.head-> next;
}
else
{
r = q-> next;
}
}
else //否则计算周转时间和带权周转时间
{
totalTimeSum += ProcessTable[q-> ID].totalTime;
weightTotalTimeSum += ProcessTable[q-> ID].weightTotalTime;

delete q; //从队列中删除q进程
q = p;
}
}while (!finish && (ProcessTable[r-> ID].arriveTime > currentTime + Round));
//下一个进程很晚才来,则继续给当前进程分配时间片

p = q;
q = q-> next;

if (q == NULL && Q.head-> next!=NULL)
{
p = Q.head;
q = p-> next;
}
}
delete Q.head;
Q.head = NULL;
}

bool RR_Run(LinkQueue& Q,QueueNode* q, QueueNode* p, const int Round,int& currentTime,PCBNode * ProcessTable)
{
if (ProcessTable[q-> ID].remainTime <= Round)//在此时间片内能够做完,之后退出进程调度
{
ProcessTable[q-> ID].finishTime = currentTime + ProcessTable[q-> ID].remainTime;
ProcessTable[q-> ID].totalTime += ProcessTable[q-> ID].remainTime;
ProcessTable[q-> ID].weightTotalTime = ProcessTable[q-> ID].totalTime/ProcessTable[q-> ID].reqTime;

currentTime = ProcessTable[q-> ID].finishTime;

p-> next = q-> next;
cout < <endl;
cout < < "进程 " < <q-> ID < < "完成! " < <endl;

return true;
}
else//此时间片内做不完
{
ProcessTable[q-> ID].remainTime = ProcessTable[q-> ID].remainTime - Round;
ProcessTable[q-> ID].totalTime += Round;
currentTime += Round;

return false;
}
}



[解决办法]
void Fcfs(LinkQueue& Q, int& totalTimeSum, int& weightTotalTimeSum,PCBNode * ProcessTable)
{
totalTimeSum = 0;
weightTotalTimeSum = 0;//平均周转时间
QueueNode* p;
QueueNode* q;

p = Q.head-> next;
if (p !=NULL )
{
ProcessTable[p-> ID].startTime = ProcessTable[p-> ID].arriveTime;
ProcessTable[p-> ID].finishTime = ProcessTable[p-> ID].arriveTime + ProcessTable[p-> ID].reqTime;
}

for(q=p-> next; q!=NULL; q=q-> next)
{

if (ProcessTable[q-> ID].arriveTime < ProcessTable[p-> ID].finishTime)
{
ProcessTable[q-> ID].startTime = ProcessTable[p-> ID].finishTime;
ProcessTable[q-> ID].finishTime = ProcessTable[p-> ID].finishTime + ProcessTable[q-> ID].reqTime;
}
else//下个进程到达时间较晚
{
ProcessTable[q-> ID].startTime = ProcessTable[q-> ID].arriveTime;
ProcessTable[q-> ID].finishTime = ProcessTable[q-> ID].arriveTime + ProcessTable[q-> ID].reqTime;
}
p = q;
}

for(q=Q.head-> next; q!=NULL; q=q-> next)
{
ProcessTable[q-> ID].totalTime = ProcessTable[q-> ID].finishTime - ProcessTable[q-> ID].arriveTime;
ProcessTable[q-> ID].weightTotalTime = ProcessTable[q-> ID].totalTime/ProcessTable[q-> ID].reqTime;

totalTimeSum += ProcessTable[q-> ID].totalTime;
weightTotalTimeSum += ProcessTable[q-> ID].weightTotalTime;
}

int t = 0;
for(q=Q.head-> next; q!=NULL; q=q-> next)
{
cout < < "********************* " < <endl;
while ( t <ProcessTable[q-> ID].finishTime )
{
cout < < "时刻 " < <t < < ": 进程 " < <q-> ID < < "活动 " < <endl;
t++;
}
if (q-> next != NULL)
{
cout < < "时刻 " < <t < < ": 进程 " < <q-> ID < < "结束活动,开始下一个进程. " < <endl;
cout < < "进程 " < <q-> ID < < "的周转时间为: " < <ProcessTable[q-> ID].totalTime < <endl;
cout < < "进程 " < <q-> ID < < "的带权周转时间为: " < <ProcessTable[q-> ID].weightTotalTime < <endl < <endl;
}
else
{
cout < < "时刻 " < <t < < ": 进程 " < <q-> ID < < "结束活动. " < <endl < <endl;
cout < < "进程 " < <q-> ID < < "的周转时间为: " < <ProcessTable[q-> ID].totalTime < <endl;
cout < < "进程 " < <q-> ID < < "的带权周转时间为: " < <ProcessTable[q-> ID].weightTotalTime < <endl < <endl;
}
}
cout < < "所有进程结束活动. " < <endl < <endl;

p = Q.head;
for(q=p-> next; q!=NULL; q=q-> next)
{
delete p;
p = q;
}
}


void InitialQueue(LinkQueue& Q, PCBNode * ProcessTable,const int processnum)
{
//初始化

for (int i=0;i <processnum;i++)
{
ProcessTable[i].processID=i;
ProcessTable[i].reqTime=ProcessTable[i].remainTime;
ProcessTable[i].finishTime=0;
ProcessTable[i].startTime=0;
ProcessTable[i].status=WAIT;
ProcessTable[i].totalTime=0;
ProcessTable[i].weightTotalTime=0;
}

Q.head = new QueueNode;
Q.head-> next = NULL;
QueueNode * p;
QueueNode * q;
for (i=0;i <processnum;i++)
{
p = new QueueNode;
p-> ID = i;
p-> next = NULL;
if (i == 0)
{
Q.head-> next = p;
}
else
q-> next = p;

q = p;
}
}


void Input(PCBNode * ProcessTable, const int processnum)
{
FILE *fp; //读入线程的相关内容
if((fp=fopen( "input.txt ", "r "))==NULL)
{
cout < < "can not open file! " < <endl;
exit(0);
}
for(int i=0;i <processnum;i++)
{
fscanf(fp, "%d %d %d ",&ProcessTable[i].arriveTime,&ProcessTable[i].remainTime,&ProcessTable[i].priorityNum);
}
fclose(fp);
}


建议输入数据:input.txt
0 4 0
1 35 1
2 10 2
3 5 3
6 9 4
7 21 5
9 35 6
11 23 7
12 42 8
13 1 9
14 7 10
20 5 11
23 3 12
24 22 13
25 31 14
26 1 15