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The Structure Pointer Operator

To make programs slightly easier to read, you can replace 
  (*g).pile1
with 
  g->pile1
'->' is an operator that takes the pointer preceding it and dereferences it before applying the member operator.

So we can rewrite the function as: 

void clear(gameState *g) {
  g->pile1 = 0;
  g->pile2 = 0;
}

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