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Addressing and Derefencing

To get a pointer to a location, use the address operator '&': 
  gameState state;
  state.pile1 = 5;
  state.pile2 = 8;
  clear(&state);
This says that the address of the struct, rather than the struct itself, is being passed.

The type signature of clear must be changed accordingly. You can use either: 

  void clear(gameState *g)
or 
  void clear(gameState* g)
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