ScoreManagementSystem/5.c

#include <stdio.h>
#include <string.h>

struct Data
{
	int ID;
	int Class;
	float score1;
	float score2;
	float score3;
	char name[101];
} stu[1001];
int stl = 0;
struct Data* stuflag = 0;

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 %s %2.1f %2.1f %2.1f", a->ID, a->Class, a->name, 
					a->score1, a->score2, a->score3);
	if (a == stuflag) printf(" inserted");
	printf("\n");
}

void Remove(struct Data* r) {
	for(; r+1 < stu+stl; r++) {
		*r = *(r+1);
	}
	stl--;
}

void Delete() {
	stu[0] = (struct Data){10001, 11, 99.5, 88.5, 89.5, "Zhang"};
	stu[1] = (struct Data){10002, 12, 77.9, 56.5, 87.5, "Yang"};
	stu[2] = (struct Data){10003, 11, 92.5, 89.0, 60.5, "Liang"};
	stl = 3;
	
	int ID = -1; char name[101];
	scanf("%s", name);
	getchar();
	int NumFlag = 1, i;
	for(i = 0; name[i]!='\0'; i++)
		if (name[i] < '0' || name[i] > '9') {
			NumFlag = 0; break;
		}
	if (NumFlag) {
		sscanf(name, "%d", &ID);
		name[0] = '\0';
	}
	
	printf("Are you sure(yes/no)?\n");
	char t;
	scanf("%c", &t);
	if (t == 'y') {
		for(i=0; i<stl; i++) {
			if(stu[i].ID == ID || name[0]!='\0' && strcmp(stu[i].name, name) == 0) {
				Remove(stu + i);
				break;
			}
		}
	}
	for (i=0; i<stl; i++) {
		print1(stu + i);
	}
}

int main() {
	Delete();
}