srednia.c

/* Srednia.c */
#include <stdio.h>

double srednia(int tab[], int rozmiar) {
    int i;
    double sum = 0;
    int count = 0;

    for (i = 0; i < rozmiar; i++)
        if (tab[i] < -3   ||   tab[i] > 3) {
            count++;
            sum += tab[i];
        }

    if (count == 0) return 0;

    return sum/count;
}

/* test! */
int main(void) {
    int tab[] = {-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7};
    int rozmiar = sizeof(tab)/sizeof(*tab);

    printf("Zadana srednia to: %g\n", srednia(tab,rozmiar));

    return 0;
}