func_code_string: #include <bits/stdc++.h>   #define ll long long   #define F first   #define S second   #define pb push_back   #define P push   #define B break   #define C continue   #define R return   #define gcd(x,y) __gcd(x,y)   #define be(a) a.begin(),a.end()   #define lb(a,x) (lower_bound(be(a),x)-a.begin())   #define ub(a,x) (upper_bound(be(a),x)-a.begin())   #define uniq(a) a.resize(unique(be(a))-a.begin())   #define fast ios::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);   #define po(x) (x%mod+mod)%mod   #define SM(x,y) (po(x)+po(y))%mod   #define M(x,y)  (po(x)*po(y))%mod   using namespace std;   ll t,n,i,j,k,l,r,mid,mod=1e9+7,m,ans;   ll a[400005],f[400005],c[400005];   char ch;   map<ll,ll>mp;   //set<ll>s;   string s,st;   //vector<ll>v[300005],u;   double x,y,z,v,d[105][105],eps=1e-9;   bool b[106][105];   double dp(int i,int j){       double &ret=d[i][j];       if(b[i][j]) R ret;       b[i][j]=1;       ret=0;       double X,Y,Z;       Z=z+((i+j)*v)/2.0;       X=x+(j*v/2.0)-i*v;       Y=y+(i*v/2.0)-j*v;       if(X<eps) {           X*=-1;           Y-=X/2.0;           Z-=X/2.0;           X=1;           for(k=1;;k++) {               ret+=Z*X*(i+j+k);               if(Y<eps) R ret;               X*=Y;               Y-=v;               Z+=v;               Z=min(Z,1.0);           }           R ret;       }       if(Y<eps) {           Y*=-1;           X-=Y/2.0;           Z-=Y/2.0;           Y=1;           for(k=1;;k++) {               ret+=Z*Y*(i+j+k);               if(X<eps) R ret;               Y*=X;               X-=v;               Z+=v;               Z=min(Z,1.0);           }           R ret;       }       R ret=X*dp(i+1,j)+Y*dp(i,j+1)+Z*(i+j+1);   }   int ff(){       cin>>x>>y>>z>>v;       memset(b,0,sizeof b);       double ans=dp(0,0);       cout<<fixed<<setprecision(8)<<ans;       R 0;   }   int main()   {       fast       cin>>t;       while(t--){           ff();           cout<<  n ;       }   }   /**      */   