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A writer is a function that inserts information into an object.
When you use writers, rather than writing into structure variables
directly, you can include additional computation in a writer. Earlier, in
Segment 389, you saw how to add a statement to the
read_trade_price reader that announces each access. The
following provides the same enhancement to the
write_trade_price writer:
void write_trade_price (double price, struct trade *tptr) {
printf ("Writing a trade price ...\n");
tptr -> price = price; }