这个怎么写最简单

Question

3定义一个描写学生基本情况的类，私有数据成员包括姓名，学号，英语和数学成绩，姓名和学号通过构造函数赋值，英语和数学成绩通过公有属性进行读写、再定义一个公有方法能同时返回总成绩和平均成绩。

Answer 1

class Student
        {
            private String m_Name = String.Empty;
            private String m_Number = String.Empty;            private float m_English = 0;
            public float English
            {
                get { return m_English; }
                set { m_English = value; }
            }            private float m_Math = 0;
            public float Math
            {
                get { return m_Math; }
                set { m_Math = value; }
            }            public Student(String name,String number)
            {
                m_Name = name;
                m_Number = number;
            }            public float[] GetScore()
            {
                float[] score = new float[2];
                score[0] = m_English + m_Math;
                score[1] = score[0] / 2;
                return score;
            }
        }

Answer 2

    public sealed class StudentInfo
    {
        #region 字段 
        string _Name;
        string _Num;
        float _EngGrade;
        float _MathGrade;
        #endregion        #region 属性 
        public string Name
        {
            get { return _Name; } 
        }        /// <summary>
        /// 学号
        /// </summary>
        public string Num
        {
            get { return _Num; } 
        }        /// <summary>
        /// 英语
        /// </summary>
        public float EngGrade
        {
            get { return _EngGrade; }
            set { _EngGrade = value; }
        }        /// <summary>
        /// 数学
        /// </summary>
        public float MathGrade
        {
            get { return _MathGrade; }
            set { _MathGrade = value; }
        }
        #endregion        #region 构造 
        public StudentInfo(string name, string num)
        {
            _Name = name;
            _Num = num;
        }
        #endregion        #region 方法
        /// <summary>
        /// 平均
        /// </summary>
        /// <returns></returns>
        public float AvgGrade()
        {
            return (_EngGrade + _MathGrade) / 2;
        }
        /// <summary>
        /// 总
        /// </summary>
        /// <returns></returns>
        public float TotalGrade()
        {
            return (_EngGrade + _MathGrade);
        }
        #endregion
    }

Answer 3

 public class Student
    {
        public int ID { get; private set; }
        public string  Name { get; private set; }
        public int EnglishSorce { get; set; }
        public int MathSorce { get; set; }
        public Student(string name,int id)
        {
            this.Name = name;
            this.ID = id;
        }
        public void GetSorceInfo(out int sumSorce,out int avgSource)
        {
            sumSorce = avgSource = 0;
            sumSorce = EnglishSorce + MathSorce;
            avgSource = sumSorce/2;
        }
    }

Answer 4

 public class Student
    {
        public Student(string name, int id)
        {
            Name = name;
            ID = id;
        }        public int ID { get; private set; }        public string Name { get; private set; }        public float? EnglishSorce { get; set; }        public float? MathSorce { get; set; }        public float? AverageScore
        {
            get
            {
                int count = 0;
                if (EnglishSorce != null)
                    count++;
                if (MathSorce != null)
                    count++;
                if (count == 0)
                    return null;
                return Total/count;
            }
        }        public float Total
        {
            get
            {                return EnglishSorce??0 + MathSorce??0;
            }
        }
    }