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Finally, the original program contains a for loop that computes
the sum of the volumes of the cylinder objects:
for (counter = 0; counter < limit; ++counter) sum = sum + oil_tanks[counter].volume ( );
The for loop in the modified program has to dereference pointers
to cylinder objects:
for (counter = 0; counter < limit; ++counter) sum = sum + oil_tank_pointers[counter] -> volume ( );