#include<stdio.h>
#include<string.h>
struct student
{
        char num[10];
        float Math;
        float Physic;
        float English;
        float sum;
        float ave;
        int class;
        int inserted;//sign whether the student is inserted
        char name[10];
        int mod;//sign whether the student is modified
};
void menu()// print menu
{
        for(int i=0;i<30;i++)
        printf(" ");
        printf("1.Input\n");
        for(int i=0;i<30;i++)
        printf(" ");
        printf("2.Output\n");
        for(int i=0;i<30;i++)
        printf(" ");
        printf("3.Order\n");
        for(int i=0;i<30;i++)
        printf(" ");
        printf("4.Quit\n");
}
void OSmenu(char x)// operation on menu
{
        if(x=='i')
        printf("You are trying to Input info\n");
        else if(x=='o')
        printf("You are trying to Output info\n");
        else if(x=='m')
        printf("You are trying to Make things ordered\n");
        else if(x=='q')
        printf("You are about to Quit\n");
        else
        printf("Wrong input\n");
}
void inputstudent(struct student *t)//input info without class
{
        scanf("%s %f %f %f",&(t->num),&(t->Math),&(t->Physic),&(t->English));
        t->sum=t->Math+t->Physic+t->English;
        t->ave=t->sum/3;
        t->inserted=0;
        t->mod=0;
}
void inputstudent2(struct student *t)//input info with class
{
        scanf("%s %d %f %f %f",&(t->num),&(t->class),&(t->Math),&(t->Physic),&(t->English));
        t->sum=t->Math+t->Physic+t->English;
        t->ave=t->sum/3;
        t->inserted=0;
        t->mod=0;
}
void inputstudent3(struct student *t)//input info with class name
{
        scanf("%s %d %s %f %f %f",&(t->num),&(t->class),&(t->name),&(t->Math),&(t->Physic),&(t->English));
        t->sum=t->Math+t->Physic+t->English;
        t->ave=t->sum/3;
        t->inserted=0;
        t->mod=0;
}
void insertstudent(struct student *t)//insert student
{
        scanf("%s %d %f %f %f",&(t->num),&(t->class),&(t->Math),&(t->Physic),&(t->English));
        t->sum=t->Math+t->Physic+t->English;
        t->ave=t->sum/3;
        t->inserted=1;
}
void outputstudent1(struct student *t)// output num and grade of all subject
{
        printf("%s %.1f %.1f %.1f %.1f\n",t->num,t->Math,t->Physic,t->English,t->sum);
}
void outputstudent2(struct student *t)// output num,sum and ave
{
        printf("%s %.1f %.1f\n",t->num,t->sum,t->ave);
}
void outputstudent3(struct student *t)// output num,class,whether inserted and grade of all subject
{
        if(t->inserted==0)
        printf("%s %d %.1f %.1f %.1f\n",t->num,t->class,t->Math,t->Physic,t->English);
        else
        printf("%s %d %.1f %.1f %.1f inserted\n",t->num,t->class,t->Math,t->Physic,t->English);
}
void outputstudent4(struct student *t)// output num,class,name,and grade of all subject
{
        printf("%s %s %d %.1f %.1f %.1f\n",t->num,t->name,t->class,t->Math,t->Physic,t->English);
}
void outputstudent5(struct student*t)//output info by class
{
        for(int i=0;i<3;i++)
        {
                if(i==0||(t+i)->class!=(t+i-1)->class)
                {
                        if((t+i)->mod==1)
                        printf("%d %s %s %.1f %.1f %.1f modified\n",(t+i)->class,(t+i)->num,(t+i)->name,(t+i)->Math,(t+i)->Physic,(t+i)->English);
                        else
                        printf("%d %s %s %.1f %.1f %.1f\n",(t+i)->class,(t+i)->num,(t+i)->name,(t+i)->Math,(t+i)->Physic,(t+i)->English);
                }
                else
                {
                        if((t+i)->mod==1)
                        printf("   %s %s %.1f %.1f %.1f modified\n",(t+i)->num,(t+i)->name,(t+i)->Math,(t+i)->Physic,(t+i)->English);
                        else
                        printf("   %s %s %.1f %.1f %.1f\n",(t+i)->num,(t+i)->name,(t+i)->Math,(t+i)->Physic,(t+i)->English);
                }
        }
}
void orderstudent(struct student *t,int n)//order without class
{
        for(int i=0;i<n;i++)
        {
                for(int j=i;j<n;j++)
                {
                        if((t+i)->sum>(t+j)->sum)
                        {
                                struct student m;
                                m=*(t+i);
                                *(t+i)=*(t+j);
                                *(t+j)=m;
                        }
                }
        }
}
void orderstudent2(struct student *t,int n)//order with class
{
        for(int i=0;i<n;i++)
        {
                for(int j=i;j<n;j++)
                {
                        if((t+i)->class>(t+j)->class)
                        {
                                struct student m;
                                m=*(t+i);
                                *(t+i)=*(t+j);
                                *(t+j)=m;
                        }
                }
        }
        for(int i=0;i<n;i++)
        {
                for(int j=i;j<n;j++)
                {
                        if((t+i)->class==(t+j)->class&&(t+i)->sum<(t+j)->sum)
                        {
                                struct student m;
                                m=*(t+i);
                                *(t+i)=*(t+j);
                                *(t+j)=m;
                        }
                }
        }
}
void removestudent(struct student *t)//remove student(num or name)
{
        for(int i=0;i<3;i++)
        outputstudent4(t+i);
        char re[10];
        char p;
        scanf("%s",re);
        for(int i=0;i<3;i++)
        {
                if(strcmp((t+i)->num,re)!=0&&strcmp((t+i)->name,re)!=0)
                {
                        outputstudent4(t+i);
                }
        }
        printf("Are you sure(yes/no)?\n");
        scanf("%c",&p);
        scanf("%c",&p);
        if(p=='n')
        {
                for(int i=0;i<3;i++)
            outputstudent4(t+i);
        }
        else
        {
                for(int i=0;i<3;i++)
                {
                        if(strcmp((t+i)->num,re)==0||strcmp((t+i)->name,re)==0)
                        {
                                for(int j=i;j<2;j++)
                                {
                                        *(t+j)=*(t+j+1);
                                }
                        }
                }
        }
}
void modstudent(struct student *t)//mod info according to num
{
        struct student f;
        inputstudent3(&f);
        for(int i=0;i<3;i++)
        {
                if(strcmp((t+i)->num,f.num)==0)
                {
                        *(t+i)=f;
                        (t+i)->mod=1;
                }
        }
}
int main()
{
        struct student s[10];
        strcpy(s[0].num,"10001");
        strcpy(s[0].name,"Zhang");
        s[0].class=11;
        s[0].Math=99.5;
        s[0].Physic=88.5;
        s[0].English=89.5;
        s[0].sum=s[0].Math+s[0].Physic+s[0].English;
        s[0].inserted=0;
        strcpy(s[1].num,"10002");
        strcpy(s[1].name,"Yang");
        s[1].class=12;
        s[1].Math=77.9;
        s[1].Physic=56.5;
        s[1].English=87.5;
        s[1].sum=s[1].Math+s[1].Physic+s[1].English;
        s[1].inserted=0;
        strcpy(s[2].num,"10003");
        strcpy(s[2].name,"Liang");
        s[2].class=11;
        s[2].Math=92.5;
        s[2].Physic=99.0;
        s[2].English=60.5;
        s[2].sum=s[2].Math+s[2].Physic+s[2].English;
        s[2].inserted=0;
        orderstudent2(&s[0],3);
        modstudent(&s[0]);
        outputstudent5(&s[0]);
        return 0;
}