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You also can assign a structure variable's value indirectly by defining a
function that assigns a value. In the following, for example, the
definition of the write_trade_price function indicates that
write_trade_price assigns a value to the
price structure variables:
void write_trade_price (double price, struct trade *tptr) {
tptr -> price = price;
}
Inasmuch as the only purpose of the write_trade_price
function is to assign a value to a structure variable, the
write_trade_price function is marked void,
indicating that no value is to be returned.