C++ 向量类实现：加减运算符重载

#include using namespace std;

class Vector { public: Vector(int n) : size(n) { data = new int[size]; for (int i = 0; i < size; i++) { data[i] = 0; } }

~Vector() {
    delete[] data;
}

int operator[](int i) const {
    return data[i];
}

int& operator[](int i) {
    return data[i];
}

Vector operator+(const Vector& v) const {
    Vector result(size);
    for (int i = 0; i < size; i++) {
        result[i] = data[i] + v[i];
    }
    return result;
}

Vector& operator+=(const Vector& v) {
    for (int i = 0; i < size; i++) {
        data[i] += v[i];
    }
    return *this;
}

Vector operator-(const Vector& v) const {
    Vector result(size);
    for (int i = 0; i < size; i++) {
        result[i] = data[i] - v[i];
    }
    return result;
}

Vector& operator-=(const Vector& v) {
    for (int i = 0; i < size; i++) {
        data[i] -= v[i];
    }
    return *this;
}

private: int* data; int size; };

int main() { Vector v1(3); v1[0] = 1; v1[1] = 2; v1[2] = 3;

Vector v2(3);
v2[0] = 4;
v2[1] = 5;
v2[2] = 6;

Vector v3 = v1 + v2;
cout << v3[0] << ' ' << v3[1] << ' ' << v3[2] << endl;

v1 += v2;
cout << v1[0] << ' ' << v1[1] << ' ' << v1[2] << endl;

Vector v4 = v1 - v2;
cout << v4[0] << ' ' << v4[1] << ' ' << v4[2] << endl;

v1 -= v2;
cout << v1[0] << ' ' << v1[1] << ' ' << v1[2] << endl;

return 0;

}