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Having redeclared the type-defining enumeration constants, you need only to
replace the conditional part of the switch statement; the rest
remains as it was:
switch (extract_car_code (input_buffer)) {
case eng_code: train[n] = new engine; break;
...
}
Thus, enumeration constants provide a form of detail-hiding data abstraction, and, as is usual with data abstraction, the use of enumeration constants simplifies change.