用c++语言编写程序，设计一个学生类，包含以下成员变量和方法: 成员变量:姓名、年龄、性别、学号、数学成绩、语文成绩、英语成绩； 方法:构造函数、析构函数、获取总分数的方法、获取平均分数的方法。请编写程序计算三位同学的总分和平均分。

以下是C++语言编写的程序：

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

class Student {
private:
    string name;
    int age;
    char gender;
    string stu_num;
    int math_score;
    int chinese_score;
    int english_score;

public:
    Student(string n, int a, char g, string num, int math, int chinese, int english) {
        name = n;
        age = a;
        gender = g;
        stu_num = num;
        math_score = math;
        chinese_score = chinese;
        english_score = english;
    }

    ~Student() {}

    int getTotalScore() {
        return math_score + chinese_score + english_score;
    }

    float getAverageScore() {
        return (float)(math_score + chinese_score + english_score) / 3;
    }
};

int main() {
    Student stu1("Tom", 18, 'M', "001", 90, 85, 95);
    Student stu2("Lucy", 19, 'F', "002", 80, 90, 95);
    Student stu3("Jerry", 20, 'M', "003", 85, 87, 88);

    cout << "Total score of " << stu1.name << " is " << stu1.getTotalScore() << endl;
    cout << "Average score of " << stu1.name << " is " << stu1.getAverageScore() << endl;

    cout << "Total score of " << stu2.name << " is " << stu2.getTotalScore() << endl;
    cout << "Average score of " << stu2.name << " is " << stu2.getAverageScore() << endl;

    cout << "Total score of " << stu3.name << " is " << stu3.getTotalScore() << endl;
    cout << "Average score of " << stu3.name << " is " << stu3.getAverageScore() << endl;

    return 0;
}

上述程序中，我们定义了一个名为`Student`的类，该类包含了姓名、年龄、性别、学号、数学成绩、语文成绩和英语成绩等成员变量，以及构造函数、析构函数、获取总分数和获取平均分数等方法。在主函数中，我们实例化了三个`Student`对象，分别为`stu1`、`stu2`和`stu3`，并调用了获取总分数和获取平均分数的方法，输出了每个学生的总分数和平均分数。