ScoreManagementSystem/8.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(int i)
{
	printf("%d,%d,%s,%.1f,%.1f,%.1f,%.1f\n", stu[i].ID, stu[i].Class, stu[i].name,
				 stu[i].score1, stu[i].score2, stu[i].score3, total(&stu[i]));
}

void Search() {
	int t; char com[101]; 
	int i;
	scanf("%d %s", &t, com);
	switch(t) {
		case 1: {
			int from, to;
			sscanf(com, "%d-%d", &from, &to);
			for (i=0; i<stl; i++) {
				if (stu[i].Class >= from && stu[i].Class <= to)
					Print1(i);
			}
		}break;
		case 2: {
			int from, to;
			sscanf(com, "%d-%d", &from, &to);
			for (i=0; i<stl; i++) {
				if (stu[i].ID >= from && stu[i].ID <= to)
					Print1(i);
			}
		}break;
		case 3: {
			for (i=0; i<stl; i++) {
				int flag = 1, j;
				for (j=0; com[j] != '*'; j++) {
					if (stu[i].name[j] != com[j]) {
						flag = 0; break;
					}
				}
				if(flag)
					Print1(i);
			}
		}break;
		case 4: {
			float gate;
			sscanf(com, "%f", &gate);
			for (i=0; i<stl; i++) {
				if (total(stu + i) >= gate - 0.01f)
					Print1(i);
			}
		}break;
		case 5: {
			int Class, from, to;
			sscanf(com, "%d.%d-%d", &Class, &from, &to);
			for (i=0; i<stl; i++) {
				if (stu[i].ID >= from && stu[i].ID <= to)
				if (stu[i].Class == Class)
					Print1(i);
			}
		}
	}
}

void Output() {
	int i;
	for(i=0; i<stl; i++) {
		printf("%d,%d,%s,%.1f,%.1f,%.1f,%.1f\n", stu[i].ID, stu[i].Class, stu[i].name,
			stu[i].score1, stu[i].score2, stu[i].score3, total(&stu[i]));
	}
}

void Typein()
{
	printf("Id ");
	scanf("%d", &stu[stl].ID);
	printf("class ");
	scanf("%d", &stu[stl].Class);
	printf("name ");
	scanf("%s", stu[stl].name);
	printf("score1 ");
	scanf("%f", &stu[stl].score1);
	printf("score2 ");
	scanf("%f", &stu[stl].score2);
	printf("score3 ");
	scanf("%f", &stu[stl].score3);
	stl++;
}

void Delete() {
	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';
	}
	for(i=0; i<stl; i++) {
		if(stu[i].ID == ID || (name[0]!='\0' && strcmp(stu[i].name, name) == 0)) {
			struct Data* r = stu + i;
			for(; r+1 < stu+stl; r++) {
				*r = *(r+1);
			}
			stl--;
			break;
		}
	}
	Output();
}

void Select_3() {
	char com[101];
	scanf("%s", com);
	int NumFlag = 1, i;
	for(i = 0; com[i]!='\0'; i++)
		if (com[i] < '0' || com[i] > '9') {
			NumFlag = 0; break;
		}
	if (NumFlag) {
		int num;
		sscanf(com, "%d", &num);
		if (strlen(com) > 2) 
			for (i=0; i<stl; i++) {
				if (stu[i].Class == num)
				Print1(i);
			}
		else 
			for (i=0; i<stl; i++) 
				if (stu[i].ID == num)
				Print1(i);
	}
	else {
		for (i=0; i<stl; i++) 
			if (strcmp(stu[i].name, com) == 0)
				Print1(i);
	}
}

int main() {
	char com[11];
	while(1) {
		printf("1.input\n");
		printf("2.delete\n");
		printf("3.select\n");
		printf("4.order\n");
		printf("5.output\n");
		printf("6.quit\n");
		printf("please input your option\n");
		int t; scanf("%d", &t);
		switch(t) {
			case 1: 
			do{
				Typein();
				printf("continue?\n");
				scanf("%s", com);
			}while(strcmp(com, "yes") == 0);
			Sort();
			break;
			case 2:
			do {
				Delete();
				printf("continue?\n");
				scanf("%s", com);
			}while(strcmp(com, "yes") == 0);
			break;
			case 3: 
			do {
				Select_3();
				printf("continue?\n");
				scanf("%s", com);
			}while(strcmp(com, "yes") == 0);
			break;
			case 4:
			Sort();
			Output();
			break;
			case 5:
			Output();
			break;
			case 6:
			return 0;
			break;
		}
	}
}