c - Pointer to a struct -

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I'm trying to understand more points and I'm having trouble with this example. 

  Typedef struct {int areaCode; Int street number; } Address; Address * Extra; Addr-> Field code = 10000; Printf ("% d \ n", addr-> field codes);

I get a segmentation fault and it does not understand why

addr is an indicator for a address structure, so I also tried it : 

  * addr-> Area code = 10000;

Even more "indirection requires pointer operator", any thoughts? 

  address * addr;

You have declared only one indicator addr , but it points to something unknown here. You have not allocated memory space for it.

To fix this, change 

  address * addr = malloc (sizeof (address));

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