[C] Dodawanie wektorów

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

void sum(double x[], double y[], double z[], int len)
{
    int i;

    for(i = 0; i < len; i++)
    {
        z[i] = x[i] + y[i];
    }

    printf("Wektor A = [ ");
    for(i = 0; i < len - 1; i++)
    {
        printf("%lf, ", x[i]);
    }
    printf("%lf ]\n", x[len - 1]);

    printf("Wektor B = [ ");
    for(i = 0; i < len - 1; i++)
    {
        printf("%lf, ", y[i]);
    }
    printf("%lf ]\n", y[len - 1]);

    printf("Wektor A + B = [ ");
    for(i = 0; i < len - 1; i++)
    {
        printf("%lf, ", z[i]);
    }
    printf("%lf ]\n", z[len - 1]);
}

int main()
{
    int n = 5;
    double a[n], b[n], c[n];

    int i;
    srand(time(NULL));
    for(i = 0; i < n; i++)
    {
        a[i] = rand() % 100;
        b[i] = rand() % 40;
    }

    sum(a, b, c, n);

    return 0;
}