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At this point, two readers, read_trade_price and
read_trade_size, and one nonreader, trade_price,
all exhibit a parameter that is assigned to a trade
object's address.
As you learned in Segment 393, you can, if you like, replace the
trade_price nonreader by a readerlike function named
read_total_cost:
double read_total_cost (struct trade *tptr) {
return tptr -> price * tptr -> number;
}