main.cpp

this a good book.

#include<iostream.h>
#include<fstream>
#include<iomanip>
#include<cmath>
using namespace std;


void WriteFile(int x)
{
	ofstream out1;
// * * 1 * * 
	out1.open("out3.txt",  );
	out1 << x << ' ';
    out1.close();
}

void ClearFile()
{
	ofstream out1;
	out1.open("out3.txt");
    out1.close();
}
class Sample
{
public:
	void disp()
	{
		cout << "m=" << m << endl;
		WriteFile(m);
		cout << "n=" << n << endl;
		WriteFile(n);
	}
// * * 2 * * 
	
};

	void main()
	{
// * * 3 * *
		
		
		ClearFile();
		Sample a;
	    a.*p=30;
// * * 4 * *
		
		a.*p=45;
		a.disp();
	}