Working with objects in array-need help

Question

Hi im doing very simple app and i wanna create array of sudents(std) and each std has array(3) grades-grade is a class as well.So each std has array of grades.Each grade has name and stdGrade.So each std has arrray of grade objects.Im trying to init std: GradeClass[] stdGradeArr = new GradeClass[3]; Console.WriteLine(Std Grade for Math); stdGradeArr [0].StdGrade = int.Parse (Console.ReadLine()); and i get error:obj ref not set to an instance of obj...

Roei Bar · Answer

here you go : using System; using System.Collections.Generic; using System.Linq; using System.Windows.Forms; namespace WindowsFormsApplication3 { static class Program { /// /// The main entry point for the application. /// [STAThread] static void Main() { Student std = new Student(); std.Grades = new Grade[3]; Console.WriteLine(Std Grade for Math); string _grade = Console.ReadLine(); std.Grades[0] = new Grade(); std.Grades[0].StdGrad = int.Parse(_grade); Console.WriteLine(Std Grade : + std.Grades[0].StdGrad); Console.ReadLine(); } public class Student { public Grade[] Grades { get; set; } } public class Grade { public int StdGrad { get; set; } } } }

patrick · Answer

What is the constructor of your gradeclass?