实验二 总结

代码如下:

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#define getpch(type)(type*)malloc(sizeof(type))
#define NULL 0    


struct jcb{
    char name[10];        //work name        
    int reachtime;        
    int starttime;
    int needtime;
    int finishtime;
    float cycletime;        //周转时间
    float weightedtime;        //带权周转时间
    float response;            //响应比
    char state;                //状态
    struct jcb *next;        //结构体指针
}*ready=NULL,*p,*q;
typedef struct jcb JCB;

int n,time=0;        //how many? time first work;
float T1=0,T2=0;

void input(){
    int i;
    printf("输入作业个数(2-24)(输入1为默认值5): ");
    scanf("%d",&n);
    if(n==1){
    n=5;
    }
    for(i=0;i<n;i++){
        p=getpch(JCB);
        printf("

");
        printf("输入作业名:");
        scanf("%s",p->name);
        printf("输入到达时间:");
        scanf("%d",&p->reachtime);
        printf("输入所需运行时间:");
        scanf("%d",&p->needtime);
    p->state='W';
    p->next=NULL;
    if(ready==NULL) ready=q=p;
    else{
        q->next=p;
        q=p;
    }
}

}
void disp(JCB *q,int m){      //显示作业运行后的周转时间及带权周转时间等
    if(m==3){                    //显示高响应比算法调度作业后的运行情况 
        printf("
作业%s正在运行,其运行情况为:
",q->name);
        printf("开始运行时刻:%d
",q->starttime);
        printf("完成时刻:%d
",q->finishtime);
        printf("周转时间:%f
",q->cycletime);
        printf("带权周转时间:%f
",q->weightedtime);
        printf("响应比:%f
",q->response);
        getch();
    }
    else{                         //显示先来先服务,最短作业优先算法调度后作业的运行情况 
         printf("
作业%s正在运行,其运行情况为:
",q->name);
         printf("开始运行时刻:%d
",q->starttime);
        printf("完成时刻:%d
",q->finishtime);
        printf("周转时间:%f
",q->cycletime);
        printf("带权周转时间:%f
",q->weightedtime);
        getch();
    }
} 
void running(JCB *p,int m){                //运行作业 
    if(p==ready){                    //先将要运行的作业从队列中分离出来 
        ready=p->next;
        p->next=NULL;
    }
    else{
        q=ready;
        while(q->next!=p){
            q=q->next;
        }
        q->next=p->next;
    }
    p->starttime=time;
    p->state='R';
    p->finishtime=p->starttime+p->needtime;
    p->cycletime=(float)(p->finishtime-p->reachtime);
    p->weightedtime=(float)(p->cycletime/p->needtime);
    T1=T1+p->cycletime;
    T2=T2+p->weightedtime;
    disp(p,m);
    time=p->needtime+time;
    p->state='F';
    printf("
%s has been finished!
 press any key to continue...
",p->name);
    free(p);
    getch();
}

void response(){            //计算队列中作业的高响应比 
    JCB *padv;
    padv=ready;
    do{
        if(padv->state=='W'&&padv->reachtime<=time)
        padv->response=(float)(time-padv->reachtime+padv->needtime)/padv->needtime;
        padv=padv->next;
    }while(padv!=NULL);
}

void final(){                    //最后打印作业的平均周转时间,平均带权周转时间 
    float s,t;
    t=T1/n;
    s=T2/n;
    getch();
    printf("

作业已全部完成!");
    printf("
%d个作业的平均周转时间是:%f",n,t);
    printf("
%d个作业的平均带权周转时间是%f:


",n,s);
}
void hrrn(int m){               //高响应比算法 
    JCB *min;
    int i,iden;
    system("cls");
    input();
    for(i=0;i<n;i++){
        p=min=ready;
        iden=1;
        response();
        do{
            if(p->state=='W'&&p->reachtime<=time){
                if(iden){
                    min=p;
                    iden=0;
                }
                else if(p->response>min->response)
                {
                    min=p;
                } 
                p=p->next;
            }
        }while(p!=NULL);
            
        if(iden){
            i--;
            time++;
            if(time>1000){
                printf("
 runtime is too long .. error..");
                getch();
            }
        }
        else{
            running(min,m);
        }
    }
        final();
}
void sjf(int m){                //最短作业优先 
    JCB *min;
    int i,iden;
    system("cls");
    input();
    for(i=0;i<n;i++){
        p=min=ready;
        iden=1;
        response();
        do{
            if(p->state=='W'&&p->reachtime<=time)
                if(iden){
                    min=p;
                    iden=0;
                }
            else if(p->response>min->response){
                min=p;
            }
            p=p->next;
        }while(p!=NULL);
        if(iden){
            i--;
            time++;
            if(time>1000){
                printf("
 runtime is too long .. error..");
                getch();
            }
            else{
                running(min,m);
            }

        }
    }
    final();
} 
void fcfs(int m){            //先来先服务 
    int i,iden;
    system("cls");
    input();
    for(i=0;i<n;i++){
        p=ready;
        iden=1;
        do{
            if(p->state=='W'&&p->reachtime<=time) iden=0;
            if(iden) p=p->next;
        }while(p!=NULL&&iden);
        if(iden){
            i--;
            printf("
没有满足要求的进程,需等待");
            time++;
            if(time>100){
                printf("
时间过长");
                getch();
            } 
            else{
                running(p,m);
            }
        }
    }
    final();
}
void output(){
    int m;
    system("cls");
    printf("

		**********************************		
");
    printf("				作业调度演示
");
    printf("


			1.先来先服务算法."); 
    printf("
			2.最短作业优先算法.");
    printf("
			3.响应比高者优先算法.");
    printf("
			0.退出程序.");
    printf("

				选择所要操作:");
    scanf("%d",&m);
    switch(m){
        case 1:
            fcfs(m);
            getch();
            system("cls");
            output();
            break;
        case 2:
            sjf(m);
            getch();
            system("cls");
            output();
            break;
        case 3:
            hrrn(m);
            getch();
            system("cls");
            output();
            break;
        case 0:
            system("cls");
            break;
        default:
            printf("选择错误,重新选择.");
            getch();
            system("cls");
            output();
    }
}

main(){
    output();
}


总结:目前这段代码还有点小问题,我会继续改进。这次的实验主要是调用函数和指针、栈的问题,之前数据结构学过的,不过。。我还给老师了。。所以这次的实验做起来很吃力,不过我会继续努力的

原文地址:https://www.cnblogs.com/colorH/p/4491463.html