Acces to another method variables c#

When I do:

Code (CSharp):

1.     public GameObject player;
2.     SpriteRenderer pSR;
3.  
4.     float playerSizeY;
5.  
6.     void Start()
7.     {
8.         SpriteRenderer pSR = player.GetComponent<SpriteRenderer>();
9.         playerSizeY = pSR.sprite.bounds.extents.y;
10.     }
11.     void Update()
12.     {
13.         Debug.Log(playerSizeY);
14.     }

It gives me the Log fine (but just 1 time)

But when I try to do this:

Code (CSharp):

1.     public GameObject player;
2.     SpriteRenderer pSR;
3.  
4.     float playerSizeY;
5.  
6.     void Start()
7.     {
8.         SpriteRenderer pSR = player.GetComponent<SpriteRenderer>();
9.     }
10.     void Update()
11.     {
12.         playerSizeY = pSR.sprite.bounds.extents.y; //error in this line of code
13.         Debug.Log(playerSizeY);
14.     }

It send me that error:
NullReferenceException: Object reference not set to an instance of an object
Forces.Update ()

 

You are declaring your variable "SpriteRenderer pSR" twice. Once as a global and once as a local to start.
Remove the "SpriteRenderer" from the start and just leave the pSR = part.

 

Then I get this error:
The name `pSR' does not exist in the current context

 

Code (CSharp):

1.     public GameObject player;
2.     SpriteRenderer pSR = player.GetComponent<SpriteRenderer>();
3.     float playerSizeY; //A field initializer cannot reference
4.                  //the nonstatic field, method, or property `Forces.player'
5.  
6.     void Start()
7.     {      
8.     }
9.     void Update()
10.     {
11.         playerSizeY = pSR.sprite.bounds.extents.y;
12.         Debug.Log(playerSizeY);
13.     }

 

Code (CSharp):

1.     public GameObject player;
2.     float playerSizeY;
3.  
4.     void Start()
5.     {
6.     SpriteRenderer pSR = player.GetComponent<SpriteRenderer>();      
7.     }
8.     void Update()
9.     {
10.         playerSizeY = pSR.sprite.bounds.extents.y; //The name `pSR' does not exist in the current context
11.         Debug.Log(playerSizeY);
12.     }

 

When you declare a variable in a method, the variable can only be read in the method.

you want pSR to be a field of your class.

You should read some tutorial of the basics of programmation

Code (CSharp):

1.     public GameObject player;
2.     float playerSizeY;
3.    SpriteRenderer pSR;
4.     void Start()
5.     {
6.     pSR = player.GetComponent<SpriteRenderer>();    
7.     }
8.     void Update()
9.     {
10.         playerSizeY = pSR.sprite.bounds.extents.y; //The name `pSR' does not exist in the current context
11.         Debug.Log(playerSizeY);
12.     }

 

I knew that, but i didn't know how to solve it, anyways, what I am doing is watching tutorials and reading books to learn, and I had this doubt