This program illustrates the found() member function from the set class.
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First we create an array of name strings, and then a set of name strings
from that array.
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Here are the 4 names in the set.
Compare their order here with their order in the array:
Alice Dick Harry Tom
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Now you can search for any name in the set.
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Enter a name, or press Enter to quit: Harry
Found Harry.

Enter another name, or press Enter to quit: John
John was not found.

Enter another name, or press Enter to quit:
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