Datoteke-Struktura Student

#include <stdio.h>


struct student {
char prezime[15];
char ime[10];
int brbod;
};

int main () {
    FILE *ulaz, *izlaz;
    ulaz=fopen("ORispiti.txt","r");
    if (ulaz==NULL) {
        printf("Greska prilikom otvaranja ulazne datoteke.");
        exit(1);
    }
    izlaz=fopen("Sortispit.txt","w");
    if (izlaz==NULL) {
        printf("Greska prilikom otvaranja izlazne datoteke.");
        fclose(ulaz);
        exit(1);
    }
    struct student PPI[300];
    int i=0, j=0, k=0;
    while(fscanf(ulaz,"%15s %10s %2d\n",PPI[i].prezime,PPI[i].ime,&PPI[i].brbod)!=EOF)
    i++;
    for (j=0; j<i-1; j++)
            for (k=j+1; k<i; k++)
                    if (PPI[k].brbod>PPI[j].brbod) {
                        struct Student temp=PPI[j];
                        PPI[j]=PPI[k];
                        PPI[k]=temp;
                    }
            j=0;
            while (j<i) {
                    fprintf(izlaz,"%-15s %-10s %2d",PPI[i].prezime,PPI[i].ime, PPI[i].brbod );
            j++;
            }
            fclose(ulaz);
            fclose(izlaz);
            return 0;
            }