考虑长度和数组指针

#include <string.h>
#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;
class CharArr {
public:
    CharArr(int size)
    :_len(size)
    ,_pstr(new char[_len]){
    }
    ~CharArr() {
        delete[]_pstr;
    }
    char &operator[](const int index) {
    static char ch = '\0';
        if (index >= 0 && index <= _len)
            return _pstr[index];
        else
            cout << "下标越界" << endl;
        return ch;
    }
private:
    int _len;
    char * _pstr;
};
int main() {

    char * text = "hello world";
    int len = strlen(text);
    CharArr cha(len);
    for (int i = 0; i < len; ++i)
    {
        cha[i]=text[i];
    }
    for (int i = 0; i < len; i++)
    {
        cout << cha[i];
    }
    cout << "\n";
    system("pause");
    return 0;
}