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


struct student{
	long FN;
	int oc[6];
	double sru;
	};
	int BrS;
	student MasStud[25];
	char bf[5];
    FILE *fp;
    char fime[31];
    student stud;

void readStud(student *st){
		int i;
	    printf("fak. Nomer: ");scanf("%d",&st->FN);
		printf("Ocenki po 3-te disciplini\n");
		for (i=0;i<3;i++){
			printf("Po %d-a disciplina:",i+1);scanf("%d",st->oc[i]);
		}
		gets(bf);
	}
void srUsp (student *st){
		int j,s=0;
		for (j=0;j<3;j++) s+=st->oc[j];
		st->sru=s/3.0;
	}
void writeStud(student st){
		int i;
	    printf("fakulteten nomer:%d\n",st.FN);
		printf("Ocenki:");
		for (i=0;i<3;i++); printf("%d",st.oc[i]);
		printf("\n");
		printf("Sreden uspeh: %4.2f\n",st.sru);
	}

void sazdaj(){
  fp=fopen(fime,"w");fclose(fp);
  printf("Fajlyt e syzdaden!\n");
}

void dobavi(){
  fp=fopen(fime,"a+b");
  char ch;
  do {
	readStud(&stud);
	fwrite(&stud,sizeof(stud),1,fp);
	printf("Îshte (y/n)?");ch=getchar();getchar();
  }while (ch!='n');
  fclose(fp);
}





void spisAll(){
  int k=0;
  fp = fopen(fime,"rb");
  fread(&stud,sizeof(stud),1,fp);
  while (!feof(fp)){
	writeStud(stud);
	k++;
	fread(&stud,sizeof(stud),1,fp);
  }
  fclose(fp);
  printf("Namereni: %d\n",k);
}



void main() {
  char otg[3];
  printf("Zadajte ime na fail:");gets(fime);
  do{
	printf("          MENU\n");
	printf("  1. Syzdavane na prazen file\n");
	printf("  2. Dobavqne na student\n");
	printf("  3. Spisyk na vsi4ki\n");
//	printf("  4. Sreden uspeh\n");
	printf("Izbor (0-kraj):");gets(otg);
	switch(otg[0]){
	case '1':sazdaj();break;
	case '2':dobavi();break;
	case '3':spisAll();break;
//	case '4':srUsp();break;
	}
  }while (otg[0]!='0');
}