const char *初值赋值以及文件读取

#include<iostream>
#include<fstream>
#include<string>
#include<cstring>
using namespace std;
class Student
{
public:
    Student(string number="123", double score=0, const char *name="noname")
    {
        this->number = number;
        this->score = score;
        this->name = new char[strlen(name) + 1];//之前写的程序总是忘记开辟空间这一步 
        strcpy(this->name, name);
    }
    ~Student() {
        //cout<<"~Stu()...."<<endl;
        delete[] name;
    }
        friend istream &operator>>(istream & is, Student& dt) {
        is >> dt.number>>dt.name>>dt.score;
        return is;
    }
    friend ostream &operator<<(ostream & os, Student& dt) {
        
        os << dt.name << "	" << dt.number << "	" << dt.score << "
";
        return os;
    }
private:
    char *name;
    string number;
    double score;
};

int main()  
{  
    Student st[5];  
    int i;  
    for(i=0;i<5;i++)  
    cin>>st[i];  
    ofstream fout("date.dat",ios::binary);  
      
    for(i=0;i<5;i++)  
    fout.write((char*)&st[i],sizeof(st[i]));  
    fout.close( );  
  
    ifstream fin("date.dat",ios::binary);  
    for(i=0;i<5;i++)  
    fin.read((char*)&st[i],sizeof(st[i]));  
     cout <<"姓名	"<<"学号	"<<"分数
"; 
    for(i=0;i<5;i++)  
    cout <<st[i];  
    fin.close( );  
    getchar();getchar();
  
    return 0;  
}