有如下的程序: #include<cstring> #include<iostream> using namespace std class MyString { public: MyString(const char*s) ~MyString(){delete[]data} Protected: unsigned len char*data } MyString::MyString(const char*s) { len=strlen(s) data=new char[len+1] strcpy(data,s) } int main() { MyString a('C++Programing') MyString b(a) return 0 } 在运行上面的出错,出错的原因是