tabela u datoteci ispit

#include <stdlib.h>
#include <stdio.h>

void f (float* niz1, float* niz2, float* niz3, float* niz4 int vel)
{
    int i=0;
    if (niz1[i]>niz2[i] && niz1[i]>niz3[i])
        niz4[i]=niz1[i];
    if (niz2[i]>niz1[i] && niz2[i]>niz3[i])
        niz4[i]=niz2[i];
    if (niz3[i]>niz1[i] && niz3[i]>niz2[i])
        niz4[i]=niz3[i];

}

int main ()
{ int i=0, vel;
float niz1[100], niz2[100], niz3[100];
    FILE* Ulaz=fopen("Brojevi.txt", "r");
    if (Ulaz==NULL) {
        printf ("Greska pri otvaranju datoteke!");
    exit (1); }
    FILE* Izlaz==fopen ("Statistika.txt", "w");
    if (Izlaz==NULL)
    {
        printf("Greska pri otvaranju datoteke! ");
        fclose(Ulaz);
        exit(1);
    }
    fscanf(Ulaz, "%d", &vel);
    while (fscanf(Ulaz, "%f %f %f", &niz1[i], &niz2[i], &niz3[i])==3 && i<100 )
        i++;
    vel=i;
    f1(niz1, niz2, niz3, niz4, vel);
    for (i=0, i<vel; i++)
    {
        fprintf(Izlaz,"%f", niz4[i]);
    }
    fclose(Ulaz);
    fclose (Izlaz);

    }