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[code] #include <iostream> #include<math.h> using namespace std; class Vect3D { friend Vect3D& operator*(double, const Vect3D&) ; friend ostream& operator<<(ostream&, const Vect3D&); public: Vect3D(); Vect3D(double, double, double); const double& operator[](int i) const; double& operator[](int i); Vect3D& operator+(const Vect3D&) const; Vect3D& operator+=(const Vect3D&); Vect3D& operator*=(double); Vect3D& operator*(double) const; bool operator==(const Vect3D&) const; …
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