Produsul primelor n numere pare

#include <iostream>

using namespace std;

int main()
{
    int n, x, i;
    cout<<"n="; cin>>n;
    x=0;
    i=1;
    while(i<=n)
    {
        cout<<x<<" ";
        x=x+2;
        i=i+1;
    }
    return 0;
}