To see how modularizing works, I rewrote the code for the traveling salesperson nearest-neighbor…

To see how modularizing works, I rewrote the code for the traveling salesperson nearest-neighbor heuristic from the previous chapter. The modified code is the file Traveling Salesperson Modified.xlsm. Now instead of one long NearestNeighbor sub, there is a short Nearest Neighbor “main” sub that calls four other subs, Get Problem Data, Initialize, Perform Heuristic, and Display Results, to do the work. The code appears below. (The comments have been omitted to emphasize the overall structure.) Note how the names of the subs indicate the basic tasks to be performed. This is always good programming practice.

           Compare the code below with the one-sub code in the original Traveling Salesperson.xlsm file. You will probably agree that the divide-and-conquer strategy used here makes the program easier to understand. It not only helps you see the big picture, but it also helps you to understand the details by presenting them in bite-sized chunks.

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