When you sort lines in ascending order, then the longest line will be the last one at the bottom (and the shortest line will be the first one on top), and if you sort lines in descending order, then the longest line will be the first one on top (and the shortest line will be the last one at the bottom). Another use case for this program is finding the longest (or shortest) string or the longest (or shortest) text line. In this program, the algorithm finds lengths of all given strings (one per line) and then sorts them by their length. On Windows, you may wish to use Notepad++. We will learn about some of these during. This way you can easily catch mistakes in the algorithm. Many other characters have special meanings on the command line. A unit test is a simple program that takes an algorithm, input data, and output data, then runs the algorithm on the input data, and compares the result with the given output data. To make sure your sorting algorithm works correctly, you may also want to write unit tests for it. For example, if you want to neatify the way your web application displays a list of data, then you may want to sort the items so that they go from the shortest item to the longest (or from the longest to the shortest). (PROC FREQ computes the same information, but does not require sorted data. A string length sorter can be useful if you're doing cross-browser testing. Because the data are sorted by the SmokingStatus variable, you can use the FIRST.SmokingStatus and LAST.SmokingStatus temporary variables to count the number of observations in each level of the SmokingStatus variable.
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