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

#define MAX_OGRENCI 10

union quiz{
	float q1, q2;
};

struct tarih{
	int gun, yil;
	char ay[10];
};

typedef struct ogrenci{
	char ID[10];
	char isim[50];
	struct tarih dT;
	float vize, final, ort;
	char harfNotu;
	union quiz q;
}Ogr;

void menu();
void OgrenciEkle();
void OgrenciListele();
void  Hesapla(int);
void OgrenciAra(char []);

Ogr ogrenciler[MAX_OGRENCI];
int sayac = 0;

int main(){
	menu();
	/*struct tarih d1 = {15, 2024, "Ocak"};
	union quiz q1;
	Ogr o1 = {"Ali", "12345", 80,90,85,'A'};
	o1.dT = d1;
	*/
	char ent[5];
	
	Ogr o1;
	int secim;
	do{
		printf("Seciminiz: ");
		scanf("%d", &secim);
		scanf("%c", &ent);
		if(secim == 1){
			OgrenciEkle();
		}
		else if (secim == 2){
			char ara[10];
			printf("Aradiginiz ID: ");
			scanf("%s", ara);
			OgrenciAra(ara);
		}
		else if(secim==3){
			OgrenciListele();
		}
		else if(secim==4){
			printf("Secim %d", secim);
		}
		else
			printf("Gecersiz islem girdiniz! ");
			
	} while(secim != -1);
	
	printf("Program Sonlanmistir......\n");	
	
	return 0;
}

void menu(){
	printf("===================\n");
	printf("1 - Ekleme\n");
	printf("2 - Arama\n");
	printf("3 - Listeleme\n");
	printf("4 - Duzenleme\n");
	printf("5 - Sil\n");
	printf("-1 - Cikis\n");
	printf("===================\n");
}

void OgrenciEkle(){
	if(sayac < MAX_OGRENCI){
		Ogr o;
		printf("Ogrenci ismini giriniz:");
		gets(o.isim);
		printf("Ogrenci No giriniz:");
		scanf("%s", o.ID);
		printf("Dogum Tarihi giriniz (d m Y): ");
		scanf("%d %s %d", &o.dT.gun, &o.dT.ay, &o.dT.yil);
		printf("Vize Notu giriniz:");
		scanf("%f", &o.vize);
		printf("Final Notu giriniz:");
		scanf("%f", &o.final);
		ogrenciler[sayac] = o;
		Hesapla(sayac);
		sayac++;
	}
	else
		printf("Maksimum ogrenci sayisina ulasildi.");
}

void OgrenciListele(){
	Ogr *ptr;
	ptr = &ogrenciler[0];
	printf("Ogrenciler Listeleniyor\n-----------------------\n");
	while(ptr->ID[0] != '\0'){
		printf("ID: %s\tIsım: %s\tD.T: %d %s %d\n"
				"Vize: %.2f\tFinal: %.2f\n"
				"Ortalama: %.2f\tHarf Notu: %c",
				ptr->ID, ptr->isim, ptr->dT.gun, ptr->dT.ay, ptr->dT.yil,
				ptr->vize, ptr->final, ptr->ort, ptr->harfNotu);
		ptr++;
	}
	printf("\n----------------------------\n");
}

void Hesapla(int indis){
	float ort = ogrenciler[indis].vize*0.4 + ogrenciler[indis].final*0.6;
	ogrenciler[indis].ort = ort;
	if(ort >= 80 && ort <=100)
		ogrenciler[indis].harfNotu = 'A';
	else if(ort >= 70 && ort <=79)
		ogrenciler[indis].harfNotu = 'B';
	else if(ort >= 60 && ort <=69)
		ogrenciler[indis].harfNotu = 'C';
	else if(ort >= 50 && ort <=59)
		ogrenciler[indis].harfNotu = 'D';
	else if(ort < 50)
		ogrenciler[indis].harfNotu = 'F';
}

int OgrenciVarmi(char id[10]){
	int bulundu = -1, i;
	for(i = 0; i < MAX_OGRENCI; i++){
		if(strcmp(id,  ogrenciler[i].ID) == 0){
			bulundu = i;
			break;
		}
	}
	return bulundu;
}

void OgrenciAra(char id[10]){
	int bulundu = OgrenciVarmi(id);
	if(bulundu > -1){
		Ogr o = ogrenciler[bulundu];
		printf("******Ogrenci Bulundu*****\n");
		printf("ID: %s\tIsım: %s\tD.T: %d %s %d\n"
				"Vize: %.2f\tFinal: %.2f\n"
				"Ortalama: %.2f\tHarf Notu: %c",
				o.ID, o.isim, o.dT.gun, o.dT.ay, o.dT.yil,
				o.vize, o.final, o.ort, o.harfNotu);
		printf("\n-------------------------\n");
	}
	else 
		printf("******Ogrenci Bulunamadi******\n");
}