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C# y u do dis to me? (C# Arrays)

Name: sadimir 2011-12-02 14:15

Switching from c++ to c# and derping hard.

The error:
"An unhandled exception of type 'System.NullReferenceException' occurred in sharp_TEST.exe

Additional information: Object reference not set to an instance of an object."

The masterpiece:

    class Program {
      static void Main() {

      Polygon4[] x = new Polygon4[20];

      foreach (Polygon4 face in x)
      {
      face.print();
      }

      }
    }
//////////////////////////////
    class Polygon4
    {
      Vertex3D a, b, c, d;
      public Polygon4()
      {
      a = new Vertex3D();
      b = new Vertex3D();
      c = new Vertex3D();
      d = new Vertex3D();

      }
      public void print()
      {
      a.print();
      b.print();
      c.print();
      d.print();

      }
    }
/////////////////////////////
    class Vertex3D
    {
      float x, y, z;
      public void print()
      {
      System.Console.Write(x+" "+y+" "+z+"\n");
      }
      public Vertex3D()
      {
      x = y = z = 0;
      }
    }

Explain c# object arrays pls

Name: Anonymous 2011-12-02 14:28

class Polygon4

You got to be seriously brain damaged by OOP to make 4-vertices polygons into a class.


                    
          
            
            Name:
                            sadimir
                                        2011-12-02 14:33
                                                               
          
            
This is a training program asshat, the names of the classes are irrelevant and don't represent anything. 

If you like it better this way rename Polygon4 into Poop and Vertex3D into Corn
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-02 14:50
                                                               
          
            
No code tags, seriously filling in the name field, insults and imageboard memes? Go back to whence you came from already.
                      
        
                    
          
            
            Name:
                            sadimir
                                        2011-12-02 16:05
                                                               
          
            
I found out that all 20 of the array members are null pointers =/

Am I supposed to do something extra to initialize the members?
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-02 16:08
                                                               
          
            
Don't help >>1.
                      
        
                    
          
            
            Name:
                            sadimir
                                        2011-12-02 16:18
                                                               
          
            
Alright /prog/ you've been as helpful as ever.

I found out the answer myself.



Obj[] a = new Obj[20]; will not populate the array. That'll take manual labor.



Also, >>6, actual programmers on /prog/ are rare and it's mostly populated by tards who think their "Hello World!" will get them into EA Games.



Case closed.
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-02 16:22
                                                               
          
            
>>1

When you create a new array, its entries get initialized with nulls. Therefore, you must initialize them yourself, as such:



Polygon4 e = new Polygon4();

for (int i = 0; i < x.Length; i++)

  x[i] = e;
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-02 20:49
                                                               
          
            
Girls' Generation 9 GET
                      
        
                    
          
            
            Name:
                            Anonymous
                                        2011-12-02 23:55
                                                               
          
            
>>5

in C# an array of objects is basically an array of pointers to Objects. Just code assuming objects are never on the stack and it will make sense.
                      
        
                    
          
            
            Name:
                            Anonymous
                                        2011-12-03 2:03
                                                               
          
            
In C# or Java:



Polygon4[] x = new Polygon4[20];



is similar to this





Polygon4** x = new Polygon4*[20];
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-03 2:45
                                                               
          
            
>>7

EA Games



DO NOT WANT



Duke Crunch'em Forever
                      
        
                    
          
            
            Name:
                                                Anonymous
                                                            2011-12-03 5:22
                                                               
          
            
you should be using generics(C++ template faggotry) anyway

just sayin'.jpg
                      
        
    
    
            
        
            
                
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C# y u do dis to me? (C# Arrays)

1 Name: sadimir 2011-12-02 14:15

2 Name: Anonymous 2011-12-02 14:28

3 Name: sadimir 2011-12-02 14:33

4 Name: Anonymous 2011-12-02 14:50

5 Name: sadimir 2011-12-02 16:05

6 Name: Anonymous 2011-12-02 16:08

7 Name: sadimir 2011-12-02 16:18

8 Name: Anonymous 2011-12-02 16:22

9 Name: Anonymous 2011-12-02 20:49

10 Name: Anonymous 2011-12-02 23:55

11 Name: Anonymous 2011-12-03 2:03

12 Name: Anonymous 2011-12-03 2:45

13 Name: Anonymous 2011-12-03 5:22

Name: sadimir 2011-12-02 14:15

Name: Anonymous 2011-12-02 14:28

Name: sadimir 2011-12-02 14:33

Name: Anonymous 2011-12-02 14:50

Name: sadimir 2011-12-02 16:05

Name: Anonymous 2011-12-02 16:08

Name: sadimir 2011-12-02 16:18

Name: Anonymous 2011-12-02 16:22

Name: Anonymous 2011-12-02 20:49

Name: Anonymous 2011-12-02 23:55

Name: Anonymous 2011-12-03 2:03

Name: Anonymous 2011-12-03 2:45

Name: Anonymous 2011-12-03 5:22