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Finally, the original program contains a for loop that computes the
sum of the prices of the trade objects; the argument
handed to trade_price is the address of an array item:
for (counter = 0; counter < limit; ++counter)
sum = sum + trade_price (&trades[counter]);
-----------------
^
*-- An address
The for loop in the modified program is nearly identical; the
address-of operator disappears, however, because array items are
the addresses of objects, rather than objects themselves:
for (counter = 0; counter < limit; ++counter)
sum = sum + trade_price (trade_pointers[counter]);
-----------------------
^
*-- Also an address