#include?“stdafx.h“
#include
#include
#include???????
#include

using?namespace?std;
class?student
{
	int?num;
	char?name[20];
	char?class1[20];
	double?chinese;
	double?math;
	double?english;
	double?sum;

public:
	double?ad（）{?return?sum?=?chinese?+?english?+?math;?}
	void?set（）
	{
		cout?<		cin?>>?num;
		cout?<		cin?>>?name;
		cout?<		cin?>>?class1;
		cout?<		cin?>>?chinese;
		cout?<		cin?>>?math;
		cout?<		cin?>>?english;
	}
	friend?void?input（）;
	friend?void?show（）;
	friend?void?find（）;
	friend?void?modify（）;
	friend?void?add（）;
	friend?void?order（）;
	friend?void?del（）;
};

student?s[100];
int?n?=?0;

int?main（）
{
	int?select;
	while?（1）
	{
		system（“cls“）;
		cout?<