struktura s ispita

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

struct Tacka
{
    double x,y;
};
struct Kruznica
{
    struct Tacka c;
    float r;
};

void funk(struct Kruznica* niz, int vel, float* a, float* b, float* c)
{
    int i=0, br1=0, br2=0, br3=0;
    float s1, s2, s3;
    for (i=0; i<vel; i++)
    { if (niz[i].r<1)
    {
        s1+=(niz[i].r)*(niz[i].r)*3.14;
        br1++;
    }
    else if (niz[i]>1 && niz[i]<2)
    {
        s2+=(niz[i].r)*(niz[i].r)*3.14;
        br2++;
    }
    else (niz[i].r>2)
    {
        s3+=niz[i].r;
        br3++;
    }

    }
    *a=s1/br1;
    *b=s2/br2;
    *c=s3/br3;
}