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\begin{cprog} typedef struct QuadTree { double Data; struct QuadTree *Children[4]; } QT; void Sum3rdChildren(QT *T, double *Result) { double Ret; if (T == 0) { Ret = 0; } else { QT *Child3 = T[0].Children[3]; double V; Sum3rdChildren(Child3, &V); Ret = V + T[0].Data; } *Result = Ret; } \end{cprog}