Grade

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Nodes
{
    class Grade
    {
        private Class[] classes { get; }

        public Grade(Class[] classes)
        {
            this.classes = classes;
        }

        public int numberOfSubjects(int ID)
        {
            foreach (Class c in classes)
            {
                Node<Student> pos = c.getStudents();

                while (pos != null)
                {
                    if (pos.getValue().ID == ID)
                    {
                        return LinkedListUtils.listLength(pos.getValue().getSubjects());
                    }
                }
            }

            return -1;
        }
    }
}