求助！！！

#include <iostream>
using namespace std;
int b[100], ans = 0;

int zc(int c, int i) {
	if (c == 2 || c == 3 || c == 5 || c == 7) {
		b[ans] == c;
		return b[ans];
	}
	if (c % 2 != 0 && c % 3 != 0 && c % 5 != 0 && c % 7 != 0&&c!=1) {
		b[ans] == c;
		return b[ans];
	}
}

int main() {
	int n, a[100];
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		cout << zc(a[i], i) << " ";
		ans++;
	}

	return 0;
}