fork(7) download
copy 
  1. using System;
  2. public class Person
  3. {
  4. 	public String Name { get; set; } = "John";
  5. }
  6.  
  7. public class Classroom
  8. {
  9.     public Person GetTeacher()
  10.     {
  11.         return null;
  12.     }
  13. }
  14.  
  15. public class Test
  16. {
  17. 	public static void Main()
  18. 	{
  19. 		Classroom classroom = new Classroom();
  20. 		var teacherName = classroom.GetTeacher().Name;
  21. 	}
  22. }
Runtime error #stdin #stdout #stderr 0.03s 26808KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
stderr
copy 
Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at Test.Main () [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at Test.Main () [0x00000] in <filename unknown>:0
https://ideone.com/p8OGBB
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!