OR-Rjesenja Nekih Zadataka-zad3

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

int Obrni (int n) {
    int nb=0, k=0;
    while (n!=0) {
            nb=nb*10+n%10;
           n/=10;
    }
    return nb;
}
int ProstBroj (int n) {
    int i;
    for (i=2; i<n; i++) {
            if (n%i==0) return 0;
    }
    return 1;
}
int ImaLiProstih (int *niz, int vel) {
    int br=0, i;
    for (i=0; i<vel; i++)
    {   if (ProstBroj(niz[i])) br++;
    }
    return br;

    }
int Razlika (int *niz, int vel) {
    if (ImaLiProstih(niz,vel)==0) return -1;
    int max_prost=-10000, i;
    int min_prost=10000;
    for (i=0; i<vel; i++) {
            if(ProstBroj(niz[i])) {
                    if (niz[i]<min_prost) min_prost=niz[i];
                    if (niz[i]>max_prost) max_prost=niz[i];
            }}
            return max_prost-min_prost;
}


int main () {
    int niz[6]={12, 11, 55, 3, 22, 25};
    printf("%d", Razlika(niz,6));
    return 0;
}