12.3. Using the Library: A Text-Query Program
To conclude our discussion of the library, we’ll implement a simple text-query program. Our program will let a user search a given file for words that might occur in it. The result of a query will be the number of times the word occurs and a list of lines on which that word appears. If a word occurs more than once on the same line, we’ll display that line only once. Lines will be displayed in ascending order—that is, line 7 should be displayed before line 9, and so on.
For example, we might read the file that contains the input for this chapter and look for the word element
. The first few lines of ...
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