C#编写了一个以对象数组为参数计算平均年龄的函数

Question

我必须创建一个函数来计算50个学生的平均年龄，这里是我的代码

        public class Student
        {
        public int[] age = new int[10];
        Student()
        {
            age[0] = 17;
            age[1] = 19;
            age[2] = 17;
            age[3] = 18;
            age[4] = 17;
            age[5] = 18;
            age[6] = 18;
            age[7] = 19;
            age[8] = 17;
            age[9] = 18;
        }

    }
    class Program
    {
        public void averageAge(Student student)
        {
            foreach(int i in student.age)
            {
                int avgage = (i += i) / 2;
            }
        }
        static void main (string[] args)
        {
          
        }

我有一个错误，说不能赋值给“I”它是一个foreach迭代变量，任何其他方法我都可以为学生的年龄初始化这个数组，因为我必须计算50个学生的平均年龄，所以赋值50个不同的时间感觉有点太多余了

我不知道这样使用foreach是怎么想的，现在我将foreach与for循环交换，如下所示：

public void averageAge(Student student)
        {
            int avgage = 0;
            for (int i =0;i<50;i++)
            {
               avgage += student.age[i];
            }
            avgage /= 50;
        }

Answer 1

使用Linq，您可以编写：

using System.Linq;

var student = new Student();

int averageAge = (int)student.age.Average();

https://docs.microsoft.com/dotnet/api/system.linq.enumerable.average

否则您可以编写以下循环：

int averageAge = 0;

for ( int index = 0; index < student.age.Length; index++ )
  averageAge = ( averageAge + student.age[index] ) / 2;

Console.WriteLine(avgage);

foreach ( int value in student.age )
  averageAge = ( averageAge + value ) / 2;

public int GetAverageAge(Student student)
{
  int result = 0;
    foreach ( int value in student.age )
      result = ( result + value ) / 2;
  return result;
}

static void main (string[] args)
{
  var student = new Student();
  int averageAge = GetAverageAge(student);
}

输出：

Linq = 17
Loop = 17

使构造函数为公共的,并且可以将方法放在类本身中：

public class Student
{
  public int[] age = new int[10];

  public int GetAverageAge()
  {
    int result = 0;
    foreach ( int value in student.age )
      averageAge = ( averageAge + value ) / 2;
    return result;
  }

  public Student()
  {
    ...
  }
}

您还可以使用属性：

public int AverageAge
{
  get
  {
    int result = 0;
    foreach ( int value in student.age )
      averageAge = ( averageAge + value ) / 2;
    return result;
  }
}

public int AverageAge => (int)age.Average();