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In the version of trade_price shown in Segment 295, the object
handed over was a trade object taken from the trades array:
trade_price(trades[counter])
In accordance with normal C argument-to-parameter rules, the
trade object was copied.
Now, however, with trade_price defined with a pointer
parameter, tptr, the object handed over must be an address
of a trade object. Accordingly, you need to use the
address-of operator, &, which obtains the address of an
object in memory:
*-- Address-of operator produces an address
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trade_price(&trades[counter])