Can't initialize a C++ array

Question

I'm trying which elements in an array(also the Fibonacci numbers) are prime or composite number.

I am given array[1...N] of integer. I am supposed to write algoritm that returns information that if in array: -All elements, which index is one of the Fibonacci numbers are composite numbers. -At least one number of the rest index is a prime number. I get an error at int main(): cannot convert '' to 'int' in assignment and: too many initializer values. My code is as follows:

#include <iostream>
#include <cstdlib>
using namespace std;
const int N = 5;
void function1(int tab[]);
bool function2(int tab[], int);
int main() {

    int tab[N], i;
    tab[N] = { 4, 8, 12, 16, 13 };
    function1(tab);
    system("pause");
    return 0;
}

void function1(int tab[]) {
    int a, b, x, i;
    bool g = 1;
    for ( i = 0; i < N, g == 1; i++) {
        a = 0;
        b = 1;
        while (i < a && i < b) {
            a = a + b;
            b = a + b;
        }
        if (i == b || i == a) {
            x = function2(tab, i);
        }
        if (!x) {
            cout << "NO";
            g = 0;
        }
    }
    int licz_pier = 0;
    i = 0;
    if (g) {
        while (i < N && licz_pier == 0) {
            if (tab[i] != 0) {
                if (function2(tab, i)) {
                    i++;
                }
                else {
                    licz_pier = 1;
                    cout << "yes" << endl;
                }
            }
        }
    }

}

bool function2(int tab[], int i) {
    int k = 2;
    bool x = 1;
    while (k < sqrt(tab[i]) && x == 1) {
        if (tab[i] % k == 0) {
            x = 0;
            tab[i] = 0;
                return 1;
        }
        k = k + 1;
    }

    if (x) {
        return 0;
    }
    return 0;
}

ps. I am beginner, this is my first post, sorry for my English.

Answer 1

The statement

tab[N] = { 4, 8, 12, 16, 13 };

is not a legal one. You need to put the initialization in the definition:

int tab[N] = { 4, 8, 12, 16, 13 };

Or manually initialize the array after the declaration, one by one:

tab[0] = 4;
tab[1] = 8;
tab[2] = 12;
tab[3] = 16;
tab[4] = 13;