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- double sqrt(double); // the square root function takes a double
- class Vector {
- public:
- Vector(int s);
- double& operator[](int i);
- int size();
- private:
- double* elem; // elem points to an array of sz doubles
- int sz;
- };
- Vector::Vector(int s) : elem {new double[s]}, sz{s}
- {}
- d
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