下面是一个Array类定义,实现数组功能，请在类体外为其添加构造函数、复制构造函数、析构函数、赋值运算符函数,下标运算符函数。 class Array {protected: int *mData;//数组数据 int mn;//数组元素个数 public: Array (int n,int value=0); Array (int *data, int n); Array (const Array &b); ~Array( ); int &operator[]（int index）; Array &oerator=(const Array &b); };

为Array类添加构造函数、复制构造函数、析构函数、赋值运算符函数和下标运算符函数的实现如下：

#include <iostream>
using namespace std;

class Array
{
protected:
    int* mData; //数组数据
    int mn;     //数组元素个数

public:
    Array(int n, int value = 0)
    {
        mn = n;
        mData = new int[mn];
        for (int i = 0; i < mn; i++)
            mData[i] = value;
    }

    Array(int* data, int n)
    {
        mn = n;
        mData = new int[mn];
        for (int i = 0; i < mn; i++)
            mData[i] = data[i];
    }

    Array(const Array& b)
    {
        mn = b.mn;
        mData = new int[mn];
        for (int i = 0; i < mn; i++)
            mData[i] = b.mData[i];
    }

    ~Array()
    {
        delete[] mData;
    }

    int& operator[](int index)
    {
        if (index < 0 || index >= mn)
            throw "Out of range!";
        return mData[index];
    }

    Array& operator=(const Array& b)
    {
        if (&b == this)
            return *this;

        delete[] mData;

        mn = b.mn;
        mData = new int[mn];
        for (int i = 0; i < mn; i++)
            mData[i] = b.mData[i];

        return *this;
    }
};

int main()
{
    int data[] = { 1, 2, 3 };
    Array a1(3, 0);
    Array a2(data, 3);

    a1 = a2;

    cout << a1[0] << " " << a1[1] << " " << a1[2] << endl;
    cout << a2[0] << " " << a2[1] << " " << a2[2] << endl;

    return 0;
}