c++代码编译没错程序停止工作怎么办

#include
#include
using namespace std;
class Student
{public:
void setName(string _name)
{m_strName=_name;
}
string getName()
{return m_strName;
}
private:
string m_strName;
};
int main()
{ Student *str=new Student[20];
str->setName("慕课网");
cout<<str<<endl;
delete str;
str=NULL;
return 0;
}

delete[] str;

你释放指针数组不对
delete []str;

delete[] str；
只能回收
new[]
?

输出的结果不是慕课网而是ox3d5b48怎么回事呀