#include <iostream>
#include <fstream>
#include <string>
using namespace std;

class Student
{
public:
	//有元宣告最後放在public裡面，不知道為啥
	friend istream& operator>>(istream&is, Student&st);
	friend ostream& operator<<(ostream&os, const Student&st);

	Student() = default;
	Student(string na, int sc)
	{
		name = na;
		score = sc;
	}
	~Student() = default;

private:
	string name;
	int score;
};

istream& operator>>(istream&is, Student&st)//ifstream是isream的子類，也能作為函式的引數
{
	is >> st.name;
	is>>st.score;
	return is;
}

ostream& operator<<(ostream&os, const Student&st)//ofstream是osream的子類，也能作為函式的引數
{
	os << st.name << " " << st.score << endl;
	return os;
}

int main()
{
     ////二進位制檔案操作

	//寫檔案
	//ofstream fout("student.dat",ios::binary);//能自動建立檔案
	//Student  s1("李明",100);
	//fout.write((char*)&s1,sizeof(s1));
	//fout.flush();
	//fout.close();

	//讀檔案
	//ifstream fin("student.dat",ios::binary);
	//Student  s2; 
	//fin.read((char*)&s2, sizeof(s2));
	//fin.close();


    ////文字檔案操作
	
	//寫檔案
    ofstream fout("student.txt");//能自動建立檔案
	Student  s1("李明", 100);
	fout << s1;
	fout.flush();
	fout.close();

	//讀檔案
    ifstream fin("student.txt");
	Student  s2;
	fin >> s2;
	fin.close();

	return 0;
}

C++的ifstream和ofstream讀寫二進位制檔案只能用read和write函式嗎？
用<<和>>即使指定了binary方式，也不能讀寫二進位制檔案