Подскажите где ошибку - C (СИ)

#include <stdio.h>
#include <math.h>
#include <conio.h>
#include <string.h>
void main(void)
{
clrscr();
 
struct stud {
    char fam[10],
         name[10],
         gr[10];
    int date,month,year;
    float rt;
 };
stud ek[3]={{"Ivanov","Ivan","ќЉ-03-1",26,2,1986,98.5},
        {"Petrov","Petr","ќЉ-03-2",14,7,1986,78.7},
        {"Sidorov","Sidor","ќЉ-03-2",8,9,1986,91.2}}, s1; int i,j;
FILE *f;
f=fopen("rgr2.dat","w");
for (i=0;i<3;i++) {
fwrite(&ek[i],sizeof(stud),1,f);}
fclose(f);
printf("‘®¤Ґа¦Ё¬®Ґ д*©«*:\n");
f=fopen("rgr2.dat","r");
if ((f=fopen("rgr2.dat","r"))==NULL) {
printf("ЋиЁЎЄ* ЇаЁ звҐ*ЁЁ д*©«*!\n");return;}
do {
fread(&s1,sizeof(stud),1,f);
if (!feof(f)) {
printf("%12s%12s%12s%12i%12i%12i%7.2f\n ",s1.fam,s1.name,s1.gr,s1.date,s1.month,s1.year,s1.rt);
}} while (!feof(f));
int d1,d2,m1,m2,y1,y2;
printf("Vvedite pervoe chislo:\n");
scanf("%i",&d1);
printf("Vvedite perviy month:\n");
scanf("%i",&m1);
printf("Vvedite perviy year:\n");
scanf("%i",&y1);
printf("Vvedite vtoroe chislo:\n");
scanf("%i",&d2);
printf("Vvedite vtoroy month:\n");
scanf("%i",&m2);
printf("Vvedite vtoroy year:\n");
scanf("%i",&y2);
printf("Studenti rodivshiesya meshdu dvumya datami:\n");
fseek(f,0L,SEEK_SET);
do {
fread(&s1,sizeof(stud),1,f);
if ((s1.year>y1)&&(s1.year<y2)&&(s1.date>d1)&&(s1.date<d2)&&(s1.month>m1)&&(s1.month<m2)) {
printf("%12s%12s%12s%12i%12i%12i%7.2f\n ",s1.fam,s1.name,s1.gr,s1.date,s1.month,s1.year,s1.rt);}
} while (!feof(f)); fclose(f);
getch();
}