自学C++，也写过一些小程序，就拿最近写的一个出来与大家分享一下，VC6编译通过且运行无误；有问题还请大家斧正！
操作系统模拟演示实验程序
这是我们操作系统课程结业时老师布置的编程题，是模拟操作一些工作方式编的程序，以更进一步了解操作系统工作方式。
这里只列出一个：按优先级调度进程运行的小程序；
这里只列出一个：按优先级调度进程运行的小程序；
////////////////////////////////////////////////////////////////////////// //Run.h #ifndef C_H_H #define C_H_H #include <conio.h> #include <iostream> #include <windows.h> #include "PCB.h" #endif int FindMax(PCB*pcb); bool Decide (PCB*pcb); PCB* Input(); void Deal(PCB*); bool m_IsNum(char ); bool m_IsNum(char * ); int GetPcbNum(PCB * pcb); void show(PCB * pcb); void showRunning(PCB*pcb,int );
////Run.cpp
#include "Run.h"
int FindMax(PCB*pcb)//找最大的优先级。
{
int num=pcb->CountPcb;
int max=0;
for(int i=0;i<num;i++){
if(pcb[i].priority>=max)
if(pcb[i].time>0 ){
max=pcb[i].priority; //优先级最大而且还没有运行完毕，就将其优先级赋给max.
}
}
for(int j=0;j<num;j++){
if(max==pcb[j].priority){
if(pcb[j].time>0){
return j; //优先级最大而且没有运行完毕，就返回下标。
}
}
}
return 0;
}
bool Decide (PCB *pcb)
{
int s=0;
for(int i=0;i<pcb->CountPcb;i++){
s+=pcb[i].time;
}
if(s==0)return false;
else
return true; //没有运行完。
}
bool m_IsNum(char c)//输入合法性。
{
return ( c<= '9' && c>='0');
return false;
}
bool m_IsNum(char * lpc)//重载函数，输入合法性。
{
int i=0;
while (lpc[i]!=0)
{
if (lpc[i]>'9' || lpc[i] <'0') return false;
i++;
}
return true;
}
int GetPcbNum(PCB * pcb)
{
return pcb->CountPcb;
}
void show(PCB * pcb)
{
int totaltime=0;
for (int ii=0;ii<pcb->CountPcb;ii++)
{
totaltime+=pcb[ii].time;
}
system("cls");
int num=pcb->CountPcb;
cout<<" "<<"PCBname "<<"Priority "<<"Time "<<"State"<<endl;
cout<<" "<<totaltime<<endl;
for(int i=0;i<num;i++)
{
cout<<""<<endl;
cout<<" "<<pcb[i].name<<" "<<pcb[i].priority<<" "<<pcb[i].time<<" "<<pcb[i].state<<endl;
cout<<""<<endl;
}
}
void showRunning(PCB * pcb,int maxmark)
{
int totaltime=0;
for (int ii=0;ii<pcb->CountPcb;ii++)
{
totaltime+=pcb[ii].time;
}
system("cls");
int num=pcb->CountPcb;
cout<<" "<<"PCBname "<<"Priority "<<"Time "<<"State"<<endl;
cout<<" "<<totaltime<<endl;
for(int i=0;i<num;i++)
{
if(i==maxmark)
{
cout<<""<<endl;
cout<<" "<<pcb[i].name<<" "<<pcb[i].priority<<" "<<pcb[i].time<<" "<<pcb[i].state<<" √"<<endl;
cout<<""<<endl;
}
else
{
cout<<""<<endl;
cout<<" "<<pcb[i].name<<" "<<pcb[i].priority<<" "<<pcb[i].time<<" "<<pcb[i].state<<endl;
cout<<""<<endl;
}
}
}
PCB* Input()
{
PCB*PCB_lINK;
char* temp="INput";
int num;
system("cls");
cout<<endl<<" =====>>>>>>>>>INPUT<<<<<<<<<===== "<<endl<<endl;
while(!m_IsNum(temp))//直到输入的为数字。
{
cout<<endl<<" Input The number of PCB you want to get in: ";
cin>>temp;
}
num =atoi(temp);
PCB_lINK=new PCB[num];
int count=0;
char * numtemp="cc";
char * tiemtemp="dd";
while(count<num)
{
cout<<""<<endl;
cout<<endl<<" The PCB "<<++count<<endl;
--count;
cout<<endl<<" PCBname: ";
cin>>PCB_lINK[count].name;
while (!m_IsNum(numtemp))
{
cout<<endl<<" Priority: ";
cin>>numtemp;
}
PCB_lINK[count].priority=atoi(numtemp);
while (!m_IsNum(tiemtemp))
{
cout<<endl<<" Time ";
cin>>tiemtemp;
}
PCB_lINK[count].time = atoi(tiemtemp);
PCB_lINK[count].CountPcb=num;
PCB_lINK[count].state=">_<";
count++;
numtemp=new char[];
tiemtemp=new char[];
}
show(PCB_lINK);
return PCB_lINK;
}
void Deal(PCB* pcb)//PCB一次运行的处理。
{
Sleep(2000);
for (int i=0;i<pcb->CountPcb;i++)
{
if (pcb[i].time==0)
{
pcb[i].state="Done";
}
else
pcb[i].state="Enable";//都置为Enable;
}
int maxmark=FindMax(pcb);
if (pcb[maxmark].time>0)
{
pcb[maxmark].state="Running";
if (pcb[maxmark].priority>0)
{
pcb[maxmark].priority--;
}
pcb[maxmark].time--;
showRunning(pcb,maxmark);
}
if(pcb[maxmark].time==0)
{
pcb[maxmark].state="Done";
pcb[maxmark].priority=0;//如果一个进程运行完毕，其优先级就置为0；
show(pcb);
}
}
// PCB.h: interface for the PCB class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_PCB_H__D437D36E_79E5_40FA_B1C3_5903CA35AA07__INCLUDED_)
#define AFX_PCB_H__D437D36E_79E5_40FA_B1C3_5903CA35AA07__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include <string>
using namespace std;
class PCB
{
public:
int priority;
int time;
string name;
string state;
int CountPcb;
public:
PCB();
virtual ~PCB();
};
#endif // !defined(AFX_PCB_H__D437D36E_79E5_40FA_B1C3_5903CA35AA07__INCLUDED_)
//Deal.cpp
#include <iostream>
#include <cstring>
#include <conio.h>
#ifndef C_H_H
#define C_H_H
#include "PCB.H"
#include "Run.h"
#endif
PCB *PCB_lINK;
int main()
{
while(1)
{
PCB_lINK=Input();
while (Decide(PCB_lINK))
{
Deal(PCB_lINK);
}
cout<<endl<<endl<<" 按任意键开始_/"<<endl;
getch();
}
return 0;
}