设计一个数组类MyArray，重载【】操作，数组初始化时，对数组的个数进行有效检查。
1、index<0 抛出异常eNegative
2、index=0抛出异常eZero
3、index>1000抛出异常eTooBig
4、index<10抛出异常eTooSmall
5、eSize类是以上类的父类，实现有参数构造、并定义virtual void printfErr（）输出错误。
具体实现如下述代码：
#include<iostream>
using namespace std;
class MyArray //创建一个MyArray类
{
private:int m_len;int *m_data;
public:MyArray(int l); //写一个含参的构造函数~MyArray();int &operator [](int index) //对[]进行重载{return m_data[index];}int GetLength(){return m_len;}class eSize //eSize作为其他异常类的父类{protected:const char *Errmsg;public:eSize(char *msg):Errmsg(msg){}void printErr(){cout << Errmsg << endl;}};class eNegative : public eSize //eNegative继承于父类eSize 类中类{public:eNegative():eSize("eNegative Exception"){}void printErr(){cout << Errmsg << endl;}};class eZero : public eSize{public:eZero():eSize("eZero Exception"){}void printErr(){cout << Errmsg << endl;}};class eTooSmall : public eSize{public:eTooSmall():eSize("eTooSmall Exception"){}void printErr(){cout << Errmsg << endl;}};class eTOoBig : public eSize{public:eTOoBig():eSize("eTooBig Exception"){}void printErr(){cout << Errmsg << endl;}};
};
MyArray::MyArray(int l) //构造函数
{m_len=l;if(m_len<0) //根据题目，抛出数组长度异常{throw eNegative();}else if(m_len==0){throw eZero();}else if(m_len>0&&m_len<=10){throw eTooSmall();}else if(m_len>1000){throw eTooBig();}m_data=new int[m_len];
}
MyArray::~MyArray()
{if(m_data!=NULL){delete [] m_data;}
}
int main()
{try{MyArray a(30);for(int i=0;i<a.GetLength();i++){a[i]=i;}}catch(MyArray::eNegative &e) //捕获异常{cout << "eNegative Exception" << endl;}catch(MyArray::eZero &e){cout << "eZero Exception" << endl;}catch(MyArray::eTOoBig &e){cout << "eTOoBig Exception" << endl;}catch(MyArray::eTooSmall &e){cout << "eTooSmall Exception" << endl;}return 0;
}