void save(void)
{
    textbackground(3);
    window(1,3,80,14);
    clrscr();
    textcolor(15);
    puttext(1,3,80,21,buf3);
    if((fp=fopen(fileName,"w"))==NULL)
    {
        window(1,3,80,25);
        gotoxy(1,21);
        clreol();
        textcolor(15);    
        cprintf(" Cannot Open File!");
        return;
    }
    if(nHead==NULL)
    {
        textbackground(3);
        window(20,10,50,13);
        clrscr();
        textcolor(15);
        window(1,3,80,25);
        gotoxy(1,21);
        clreol();
        cprintf(" HeadPoint Is Empty.");
        return;
    }
    nCurrent=nHead;
    do
    {
        fwrite(nCurrent,sizeof(struct student),1,fp);
        nCurrent=nCurrent->next;    
    }while(nCurrent!=NULL);
    window(1,3,80,25);
    gotoxy(1,21);
    clreol();
    textcolor(15);
    cprintf(" Save file %s complate!",fileName);
    fclose(fp);
}

void saveTo(void)
{
    char savefile[30];
    show(2);
    gets(savefile);
    strcpy(fileName,savefile);
    if(nHead==NULL)
    {
        textbackground(3);
        window(20,10,50,13);
        clrscr();
        textcolor(15);
        window(1,3,80,25);
        gotoxy(1,21);
        clreol();
        cprintf(" HeadPoint Is Empty.");
        return;
    }
    if((fp=fopen(savefile,"w"))==NULL)
    {    
        window(1,3,80,25);
        gotoxy(1,21);
        clreol();
        cprintf(" Cannot Open File.");
        return;
    }    
    textbackground(3);
    window(1,3,80,14);
    clrscr();
    textcolor(15);
    nCurrent=nHead;
    do
    {
        fwrite(nCurrent,sizeof(struct student),1,fp);
        nCurrent=nCurrent->next;    
    }while(nCurrent!=NULL);
    recordList();
    textcolor(15);
    window(1,3,80,25);
    gotoxy(1,21);
    clreol();
    cprintf(" Save file %s complete.",fileName);
    gotoxy(1,22);
    clreol();
    cprintf(" File Name: %s",fileName);
    fclose(fp);
}

void seleteAll(void)
{
    int count=0,countSex=0,countMaths=0,countChinese=0,countEnglish=0;
    puttext(1,3,80,21,buf3);
    nCurrent=nHead;
    if(nHead==NULL)
    {
        window(1,3,80,25);
        gotoxy(1,21);
        clreol();
        textcolor(15);
        clreol();
        cprintf(" Data Is Empty!");
        return;
    }
    do
    {
        count++;   
        if(nCurrent->stuSex=='m')
        {    countSex++;    }
        if(nCurrent->stuMaths>=60)
        {    countMaths++;    }
        if(nCurrent->stuChinese>=60)
        {    countChinese++;    }
        if(nCurrent->stuEnglish>=60)
        {    countEnglish++;    }
        nCurrent=nCurrent->next;
    }while(nCurrent!=NULL);
    window(1,3,80,25);
    gotoxy(1,21);
    textbackground(3);
    textcolor(15);
    clreol();
    cprintf(" Tall Data: %d Record. Men %d. Maths %d Pass. Chinese %d Pass. English %d Pass.\n",count,countSex,countMaths,countChinese,countEnglish);
}
void seleteDelete(int num)
{
    int deleteInt;
    char deleteChar[20];
    show(5);
    if(num==2)cprintf("No:");
    else      cprintf("Name:");
    gets(deleteChar);
    if(num==2)
    {    deleteInt=atoi(deleteChar);    }
    nCurrent=nHead;
    if(nHead==NULL)
    {
        textbackground(3);
        window(20,10,50,13);
        clrscr();
        window(1,23,80,25);
        gotoxy(1,1);
        clreol();
        textcolor(15);
        clreol();
        cprintf("File Is Empty!");
        return;
    }
    textbackground(3);
    window(20,10,50,13);
    clrscr();
    puttext(1,3,80,21,buf3);
    window(1,23,80,25);
    gotoxy(1,1);
    textcolor(15);
    clreol();
    do
    {
        if(num==2&&nHead->stuNo==deleteInt)
        {
            nHead=nHead->next;
        }
        if(num==3&&strcmp(nHead->stuName,deleteChar)==0)    
        {
            nHead=nHead->next;
        }
        if(num==2&&nTail->stuNo==deleteInt)
        {
            nTail=nTail->prev;
        }
        if(num==3&&strcmp(nTail->stuName,deleteChar)==0)
        {
            nTail=nTail->prev;
        }
        if(num==2&&nCurrent->stuNo==deleteInt)
        {
            nCurrent->prev->next=nCurrent->next;
            nCurrent->next->prev=nCurrent->prev;
            gotoxy(2,1);cprintf("%d",nCurrent->stuNo);
            gotoxy(11,1);cprintf("%s",nCurrent->stuName);
            gotoxy(26,1);cprintf("%c",nCurrent->stuSex);
            gotoxy(37,1);cprintf("%f",nCurrent->stuMaths);
            gotoxy(50,1);cprintf("%f",nCurrent->stuChinese);
            gotoxy(65,1);cprintf("%f",nCurrent->stuEnglish);
            textbackground(3);
            window(1,3,80,21);
            clrscr();
            pageCount=1;
            showPageCount();    
            recordList();
            return;
        }
        if(num==3&&strcmp(nCurrent->stuName,deleteChar)==0)
        {
            nCurrent->prev->next=nCurrent->next;
            nCurrent->next->prev=nCurrent->prev;
            gotoxy(2,1);cprintf("%d",nCurrent->stuNo);
            gotoxy(11,1);cprintf("%s",nCurrent->stuName);
            gotoxy(26,1);cprintf("%c",nCurrent->stuSex);
            gotoxy(37,1);cprintf("%f",nCurrent->stuMaths);
            gotoxy(50,1);cprintf("%f",nCurrent->stuChinese);
            gotoxy(65,1);cprintf("%f",nCurrent->stuEnglish);
            textbackground(3);
            window(1,3,80,21);
            clrscr();
            pageCount=1;
            showPageCount();
            recordList();
            return;
        }
        nCurrent=nCurrent->next;
    }while(nCurrent!=NULL);
    gotoxy(1,1);
    clreol();
    cprintf(" Delete Data Complete!");
}

void seleteTall(int num)
{
    int i;
    struct student *max;
    textbackground(3);
    window(23,6,38,13);
    puttext(1,3,80,21,buf3);
    if(nHead==NULL)
    {
        window(1,23,80,25);
        gotoxy(1,1);
        clreol();
        textcolor(15);
        clreol();
        cprintf("File Is Empty!");
        return;
    }
     for(nCurrent=nHead;nCurrent->next!=NULL;nCurrent=nCurrent->next)
    {
        max=nCurrent;
        for(nTemp=nCurrent->next;nTemp!=NULL;nTemp=nTemp->next)
        {
            switch(num)
            {
                case 2:i=max->stuNo>nTemp->stuNo;break;
                case 3:i=strcmp(max->stuName,nTemp->stuName)>0;break;
                case 4:i=max->stuMaths>nTemp->stuMaths;break;
                case 5:i=max->stuChinese>nTemp->stuChinese;break;
                case 6:i=max->stuEnglish>nTemp->stuEnglish;break;
            }
            if(i!=1)
            {
                max=nTemp;
            }
        }
        max->prev->next=max->next;
        max->next->prev=max->prev;
        max->next=nHead;
        nHead=max;
    }
    window(1,23,80,25);
    gotoxy(1,1);
    textcolor(15);
    clreol();
    cprintf(" Tall Complete Complete!");
    pageCount=1;
    showPageCount();
    recordList();
}