Signal 11 in a prime factorization problem

Question

Apparently I am attempting to access a memory adress that hasn't been allocated. Can someone please tell me where? (The program to prime factorize n given numbers)

#include <iostream>

using namespace std;

void sieve(int n){
    int primes[n + 1];
    for(int i = 2; i <= n; i++){
        primes[i] = i;
    }
    for(int i = 2; i <= n; i++){
        if(primes[i] == i){
            for(int j = i*i; j <= n; j += i){
                if(primes[j] == j){
                    primes[j] = i;
                }
            }
        }
    }
    while(n != 1){
        cout << primes[n] << " ";
        n /= primes[n];
    }
    cout << endl;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie();
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        sieve(x);
    }
}

Answer 1

This loop is very suspect:

while(n != 1){
    cout << primes[n] << " ";
    n /= primes[n];
}

How sure are you that n won't become 0? And you haven't initialized primes[0] to anything, so it could be any random value. At that point, n becomes who knows what, and you're off in la-la land.