#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll=vector<long long>;
template<typename T>T get(){T r;cin>>r;return r;}
template<typename T>vector<T> get_v(ll n){vector<T> v;for(int i=0;i!=n;i++){v.push_back(get<T>());};return v;}
template<typename T>void show_v(vector<T> v){
    for(ll i=0;i!=v.size()-1;i++) cout<<v[i]<<" ";cout<<*(v.end()-1)<<endl;cout<<""<<endl;}

int main() {
    ll t=get<ll>();
    vector<vector<ll>> p(t);
    for(ll i=0;i!=t;i++){
        ll d,a;cin>>d>>a;
        vll x=get_v<ll>(d);
        for(ll j=0;j!=x.size();j++){
            p[i].push_back(0.5+(double)x[j]/a);
        }
    }
    for(auto const &i:p){
        show_v(i);
    }

    system("pause");
}