/* Vector3.h */ class Vector3 { public: float x, y, z; Vector3(); }; /* Vector3.cpp */ #include "vector3.h" Vector3::Vector3() { this->x = 0.0f; this->y = 0.0f; this->z = 0.0f; } /* main.cpp */ { Vector3 vec; // ←できる Vector3 vec(); // ←…