为啥只有零分？？？

#include<bits/stdc++.h>
using namespace std;
int n, a[101];
bool zhi(int a) {
	if (a < 2)
		return false;
	for (int i = 2; i <= sqrt(a); i++)
		if (a % i == 0)
			return false;
	return true;
}
int main() {
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	for (int i = 1; i <= n; i++)
		if (zhi(a[i]))
			cout << a[i] << endl;
	return 0;
}

求助大佬！！！

求发题解
感谢