hwh/6th.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 100
typedef struct {
	int ID;
	char name[30];
	int classnumber;
	float score1,score2,score3;
}student;

int find(int ID,const char *name,student students[],int count){
	int i;
	for(i=0;i<count;i++){
		if(students[i].ID==ID){
			return i;
		}
	}
	return -1;
}
void modifystudent(student students[],int index,float newscore1,float newscore2,float newscore3){
	students[index].score1=newscore1;
	students[index].score2=newscore2;
	students[index].score3=newscore3;
}


int compare(const void*a,const void *b){
	student s1=*(student*)a;
	student s2=*(student*)b;
	if(s1.classnumber!=s2.classnumber){
		return s1.classnumber-s2.classnumber;
	}
	float total1=s1.score1+s1.score2+s1.score3;
	float total2=s2.score1+s2.score2+s2.score3;
	return total2-total1;
}
void print(student students[],int n,int modifiedindex){
	int classn=-1;
	
	int j;
	for(j=0;j<n;j++){
		if(students[j].classnumber!=classn){
			classn=students[j].classnumber;
			
			printf("%d %d %s %.1f %.1f %.1f",students[j].classnumber,students[j].ID,students[j].name,students[j].score1,students[j].score2,students[j].score3);
				if(j==modifiedindex){
			printf(" modified\n");
		}
		}else{
		printf("   %d %s %.1f %.1f %.1f\n",students[j].ID,students[j].name,students[j].score1,students[j].score2,students[j].score3);
	    	}
	
		
	}
}
int main(){
	student students[MAX_STUDENTS];
    int n = 3;
    students[0].ID= 10001;
    students[0].classnumber = 11;
    strcpy(students[0].name, "Zhang");
    students[0].score1 = 99.5;
    students[0].score2 = 88.5;
    students[0].score3 = 89.5;

    students[1].ID= 10002;
    students[1].classnumber = 12;
    strcpy(students[1].name, "Yang");
    students[1].score1 = 77.9;
    students[1].score2 = 56.5;
    students[1].score3 = 87.5;

    students[2].ID= 10003;
    students[2].classnumber= 11;
    strcpy(students[2].name, "Liang");
    students[2].score1 = 92.5;
    students[2].score2 = 99.0;
    students[2].score3 = 60.5;
    qsort(students,n,sizeof(student),compare);
    student newstudent;
    scanf("%d %d %s %f %f %f",&newstudent.ID,&newstudent.classnumber,&newstudent.name,&newstudent.score1,&newstudent.score2,&newstudent.score3);
	int index=find(newstudent.ID,NULL,students,n);
	int modifiedindex=-1;
	if(index!=-1){
		modifystudent(students,index,newstudent.score1,newstudent.score2,newstudent.score3);
		modifiedindex=index;
	}
	
	print(students,n, modifiedindex);
	return 0;
}