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【C】可变分区存储管理模拟系统
作者:郭剑锋 / 发布于2013/6/20/ 447
可变分区存储管理模拟系统（FIFO,最优适应分配算法,最坏适应算法）

	#include<stdio.h>
	#include<iostream.h>
	#include<string.h>
	#include<iomanip.h>

	const int MAXJOB=100;//定义表最大记录数

	typedef struct node {
	int start;
	int length;
	char tag[20];
	} job;

	job frees[MAXJOB];//定义空闲区表
	int free_quantity;

	job occupys[MAXJOB];//定义已分配区表
	int occupy_quantity;

	//初始化函数
	void initial() {
	int i;

	for ( i=0; i<MAXJOB; i++ ) {
	 frees[i].start=-1;
	 frees[i].length=0;
	 strcpy ( frees[i].tag,"free" );

	 occupys[i].start=-1;
	 occupys[i].length=0;
	 strcpy ( occupys[i].tag,"" );
	}
	free_quantity=0;
	occupy_quantity=0;
	}

	//读数据函数
	int readData() {
	FILE *fp;
	char fname[20];

	cout<<"请输入初始空闲表文件名:";
	cin>>fname;

	if ( ( fp=fopen ( fname,"r" ) ) ==NULL ) {
	 cout<<"错误,文件打不开,请检查文件名"<<endl;
	} else {
	 while ( !feof ( fp ) ) {
	 fscanf ( fp,"%d,%d",&frees[free_quantity].start,&frees[free_quantity].length );
	 free_quantity++;
	 }
	 return 1;
	}
	return 0;
	}

	//sort
	void sort() {
	int i,j,p;

	for ( i=0; i<free_quantity-1; i++ ) {
	 p=i;
	 for ( j=i+1; j<free_quantity; j++ ) {
	 if ( frees[j].start<frees[p].start ) {
	 p=j;
	 }
	 }
	 if ( p!=i ) {
	 frees[free_quantity]=frees[i];
	 frees[i]=frees[p];
	 frees[p]=frees[free_quantity];
	 }
	}
	}

	
	//显示函数
	void view() {
	int i;

	cout<<endl<<"----------------------------------------------------------"<<endl;
	cout<<"当前空闲表:"<<endl;
	cout<<"起始地址 长度 状态"<<endl;
	for ( i=0; i<free_quantity; i++ ) {
	 cout.setf ( 2 );
	 cout.width ( 12 );
	 cout<<frees[i].start;
	 cout.width ( 10 );
	 cout<<frees[i].length;
	 cout.width ( 8 );
	 cout<<frees[i].tag<<endl;
	}

	cout<<endl<<"----------------------------------------------------------"<<endl;
	cout<<"当前已分配表:"<<endl;
	cout<<"起始地址 长度 占用作业名"<<endl;
	for ( i=0; i<occupy_quantity; i++ ) {
	 cout.setf ( 2 );
	 cout.width ( 12 );
	 cout<<occupys[i].start;
	 cout.width ( 10 );
	 cout<<occupys[i].length;
	 cout.width ( 8 );
	 cout<<occupys[i].tag<<endl;
	}
	}

	//最先适应分配算法
	void earliest() {
	char job_name[20];
	int job_length;
	int i,j,flag,t;

	cout<<"请输入新申请内存空间的作业名和空间大小:";
	cin>>job_name;
	cin>>job_length;

	flag=0;
	for ( i=0; i<free_quantity; i++ ) {
	 if ( frees[i].length>=job_length ) {
	 flag=1;
	 }
	}
	if ( flag==0 ) {
	 cout<<endl<<"Sorry,当前没有能满足你申请长度的空闲内存,请稍候再试"<<endl;
	} else {
	 t=0;
	 i=0;
	 while ( t==0 ) {
	 if ( frees[i].length>=job_length ) {
	 t=1;
	 }
	 i++;
	 }
	 i--;
	 occupys[occupy_quantity].start=frees[i].start;
	 strcpy ( occupys[occupy_quantity].tag,job_name );
	 occupys[occupy_quantity].length=job_length;
	 occupy_quantity++;

	 if ( frees[i].length>job_length ) {
	 frees[i].start+=job_length;
	 frees[i].length-=job_length;
	 } else {
	 for ( j=i; j<free_quantity-1; j++ ) {
	 frees[j]=frees[j+1];
	 }
	 free_quantity--;
	 cout<<"内存空间成功:)"<<endl;
	 }
	}
	}
	//最优适应分配算法
	void excellent() {
	char job_name[20];
	int job_length;
	int i,j,flag,t;

	cout<<"请输入新申请内存空间的作业名和空间大小:";
	cin>>job_name;
	cin>>job_length;

	flag=0;
	for ( i=0; i<free_quantity; i++ ) {
	 if ( frees[i].length>=job_length ) {
	 flag=1;
	 }
	}
	if ( flag==0 ) {
	 cout<<endl<<"Sorry,当前没有能满足你申请长度的空闲内存,请稍候再试"<<endl;
	} else {
	 t=0;
	 i=0;
	 while ( t==0 ) {
	 if ( frees[i].length>=job_length ) {
	 t=1;
	 }
	 i++;
	 }
	 i--;
	 for ( j=0; j<free_quantity; j++ ) {
	 if ( ( frees[j].length>=job_length ) && ( frees[j].length<frees[i].length ) ) {
	 i=j;
	 }
	 }

	 occupys[occupy_quantity].start=frees[i].start;
	 strcpy ( occupys[occupy_quantity].tag,job_name );
	 occupys[occupy_quantity].length=job_length;
	 occupy_quantity++;

	 if ( frees[i].length>job_length ) {
	 frees[i].start+=job_length;
	 frees[i].length-=job_length;
	 } else {
	 for ( j=i; j<free_quantity-1; j++ ) {
	 frees[j]=frees[j+1];
	 }
	 free_quantity--;
	 cout<<"内存空间成功:)"<<endl;
	 }
	}
	}

	//最坏适应算法
	void worst() {
	char job_name[20];
	int job_length;
	int i,j,flag,t;

	cout<<"请输入新申请内存空间的作业名和空间大小:";
	cin>>job_name;
	cin>>job_length;

	flag=0;
	for ( i=0; i<free_quantity; i++ ) {
	 if ( frees[i].length>=job_length ) {
	 flag=1;
	 }
	}
	if ( flag==0 ) {
	 cout<<endl<<"Sorry,当前没有能满足你申请长度的空闲内存,请稍候再试"<<endl;
	} else {
	 t=0;
	 i=0;
	 while ( t==0 ) {
	 if ( frees[i].length>=job_length ) {
	 t=1;
	 }
	 i++;
	 }
	 i--;
	 for ( j=0; j<free_quantity; j++ ) {
	 if ( ( frees[j].length>=job_length ) && ( frees[j].length>frees[i].length ) ) {
	 i=j;
	 }
	 }

	 occupys[occupy_quantity].start=frees[i].start;
	 strcpy ( occupys[occupy_quantity].tag,job_name );
	 occupys[occupy_quantity].length=job_length;
	 occupy_quantity++;

	 if ( frees[i].length>job_length ) {
	 frees[i].start+=job_length;
	 frees[i].length-=job_length;
	 } else {
	 for ( j=i; j<free_quantity-1; j++ ) {
	 frees[j]=frees[j+1];
	 }
	 free_quantity--;
	 cout<<"内存空间成功:)"<<endl;
	 }
	}
	}

	//撤消作业
	void finished() {
	char job_name[20];
	int i,j,flag,p=0;
	int start;
	int length;

	cout<<"请输入要撤消的作业名:";
	cin>>job_name;

	flag=-1;
	for ( i=0; i<occupy_quantity; i++ ) {
	 if ( !strcmp ( occupys[i].tag,job_name ) ) {
	 flag=i;
	 start=occupys[i].start;
	 length=occupys[i].length;
	 }
	}
	if ( flag==-1 ) {
	 cout<<"没有这个作业名"<<endl;
	} else {
	//加入空闲表
	 for ( i=0; i<free_quantity; i++ ) {
	 if ( ( frees[i].start+frees[i].length ) ==start ) {
	 if ( ( ( i+1 ) <free_quantity ) && ( frees[i+1].start==start+length ) ) {
	 frees[i].length=frees[i].length+frees[i+1].length+length;
	 for ( j=i+1; j<free_quantity; j++ ) {
	 frees[j]=frees[j+1];
	 }
	 free_quantity--;
	 p=1;
	 } else {
	 frees[i].length+=length;
	 p=1;
	 }
	 }
	 if ( frees[i].start== ( start+length ) ) {
	 frees[i].start=start;
	 frees[i].length+=length;
	 p=1;
	 }
	 }

	 if ( p==0 ) {
	 frees[free_quantity].start=start;
	 frees[free_quantity].length=length;
	 free_quantity++;
	 }

	

	//删除分配表中的该作业

	 for ( i=flag; i<occupy_quantity; i++ ) {
	 occupys[i]=occupys[i+1];
	 }
	 occupy_quantity--;
	}
	}


	//显示版权信息函数
	void version() {
	cout<<endl<<endl;

	cout<<" ┏━━━━━━━━━━━━━━━━━━━━━━━┓"<<endl;
	cout<<" ┃　　　 　可变分区存储管理模拟系统　 　　　　 ┃"<<endl;
	cout<<" ┠───────────────────────┨"<<endl;
	cout<<" ┃　 　(c)All Right Reserved Neo　　　 　　　┃"<<endl;
	cout<<" ┃　　　　　　sony006@163.com　　 　　　　　　　┃"<<endl;
	cout<<" ┃　　　　　version 2004 build 1122　　　　　　┃"<<endl;
	cout<<" ┗━━━━━━━━━━━━━━━━━━━━━━━┛"<<endl;
	cout<<endl<<endl;
	}


	void main() {

	int flag=0;
	int t=1;
	int chioce=0;

	version();
	initial();

	flag=readData();

	while ( flag==1 ) {

	 sort();
	 cout<<endl<<endl<<"========================================================="<<endl;
	 cout<<" 可变分区存储管理模拟系统"<<endl;
	 cout<<"========================================================="<<endl;
	 cout<<" 1.申请空间 2.撤消作业 3.显示空闲表和分配表 0.退出"<<endl;
	 cout<<"请选择:";
	 cin>>chioce;

	 switch ( chioce ) {
	 case 1:
	//换算法请换下一句调用
	 earliest();
	 break;
	 case 2:
	 finished();
	 break;
	 case 3:
	 view();
	 break;
	 case 0:
	 flag=0;
	 break;
	 default:
	 cout<<"选择错误!"<<endl;
	 }
	}
	}
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