ScoreManagementSystem/4.c

#include <stdio.h>

struct Data
{
	int ID;
	int Class;
	float score1;
	float score2;
	float score3;
} stu[1001];
int stl = 0;
struct Data* stuflag;

float total(struct Data* a) {
	return a->score1 + a->score2 + a->score3;
}

void swap(struct Data* a, struct Data* b) {
	struct Data t = *a;
	*a = *b;
	*b = t;

	if (a == stuflag) stuflag = b;
else 
	if (b == stuflag) stuflag = a;
}

void Sort() {
	int i, j;
	for(i = 0; i < stl-1; i++) {
		for (j = 0; j < stl-i-1; j++) {
			if (stu[j].Class < stu[j+1].Class) continue;
			if (stu[j].Class > stu[j+1].Class || 
			total(&stu[j]) < total(&stu[j+1])) swap(&stu[j], &stu[j+1]);
		}
	}
}

void input1() {
	scanf("%d", &stu[stl].ID);
	scanf("%f", &stu[stl].score1);
	scanf("%f", &stu[stl].score2);
	scanf("%f", &stu[stl].score3);
	stl++;
}


void Input() {
	printf("Please input info of three students:\n");
	input1();input1();input1();
	if (total(&stu[stl-3]) < total(&stu[stl-2])) swap(&stu[stl-3], &stu[stl-2]);
	if (total(&stu[stl-2]) < total(&stu[stl-1])) swap(&stu[stl-2], &stu[stl-1]);
	if (total(&stu[stl-3]) < total(&stu[stl-2])) swap(&stu[stl-3], &stu[stl-2]);
	printf("%d,%.1f,%.1f\n", stu[stl-3].ID, total(&stu[stl-3]), total(&stu[stl-3])/3.0f);
	printf("%d,%.1f,%.1f\n", stu[stl-2].ID, total(&stu[stl-2]), total(&stu[stl-2])/3.0f);
	printf("%d,%.1f,%.1f\n", stu[stl-1].ID, total(&stu[stl-1]), total(&stu[stl-1])/3.0f);
}

void print1(struct Data* a) {
	printf("%d %d %2.1f %2.1f %2.1f", a->ID, a->Class,
					a->score1, a->score2, a->score3);
	if (a == stuflag) printf(" inserted");
	printf("\n");
}

void Insert() {
	stu[0] = (struct Data){10001, 11, 99.5, 88.5, 89.5};
	stu[1] = (struct Data){10002, 12, 77.9, 56.5, 87.5};
	stu[2] = (struct Data){10003, 11, 92.5, 89.0, 60.5};
	stl = 3;
	
	scanf("%d", &stu[stl].ID);
	scanf("%d", &stu[stl].Class);
	scanf("%f", &stu[stl].score1);
	scanf("%f", &stu[stl].score2);
	scanf("%f", &stu[stl].score3);
	stl++;
	
	stuflag = stu + 3;
	Sort();
	print1(stu + 0);
	print1(stu + 1);
	print1(stu + 2);
	print1(stu + 3);
}

int main() {
	Insert();
}