ScoreManagementSystem/3.c

#include <stdio.h>

struct Data
{
	int ID;
	float score1;
	float score2;
	float score3;
} stu[1001];
int stl = 0, sortstl;

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;
}

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);
}

int main() {
	printf("                              1.Input\n");
	printf("                              2.Output\n");
	printf("                              3.Order\n");
	printf("                              4.Quit\n");
	char t;
	scanf("%c", &t);
	switch(t) {
		case 'i':
		printf("You are trying to Input info\n");
		Input();
		break;
		case 'o':
		printf("You are trying to Output info\n");
		break;
		case 'm':
		printf("You are trying to Make things ordered\n");
		break;
		case 'q':
		printf("You are trying to Quit\n");
		break;
		default:
		printf("Wrong input\n");
		break;
	}
}