Exercise 625 in Java

Encoder QR Code ISO/IEC18004 in Java Exercise 625
Exercise 625
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Explain why we need to use the special inserter iterator to populate the exclusion word set (It is briefly explained in Section 6131, and discussed in detail in Section 1241)
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set<string> exclusion_set; ifstream infile( "exclusion_set" ); // copy( default_excluded_words, default_excluded_words+25, inserter( exclusion_set, exclusion_setbegin() ));
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Exercise 626
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Our original implementation reflects a procedural solution that is, a collection of global functions operating on an independent set of unencapsulated data structures Our final program reflects an alternative solution in which we wrap the functions and data structures within a TextQuery class Compare the two approaches What are the drawbacks and strengths of each
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Exercise 627
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In this version of the program, the user is prompted for the text file to be handled A more convenient implementation would allow the user to specify the file on the program command line we'll see how to support command line arguments to a program in 7 What other command line options should our program support Multimap/Multiset Both a map and a set can contain only a single instance of each key A multiset and a multimap allow for multiple occurrences of a key to be stored In a phone directory, for example, someone might wish to provide a separate listing for each phone number associated with an individual A listing of available texts by an author might provide a separate listing for each title, or a text might provide a separate location pair for each occurrence of a word within the text To use a multimap or multiset, we need to include the associated map or set header file
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#include <map> multimap< key_type, value_type > multimapName;
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// indexed by string, holding list< string > multimap< string, list< string > > synonyms; #include <set> multiset< type > multisetName;
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For either a multimap or a multiset, one iteration strategy is to use a combination of the iterator returned by find() (it points to the first instance) and the value returned by count() (This works because the instances are guaranteed to occur contiguously within the container) For example:
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#include <map> #include <string> void code_fragment() { multimap< string, string > authors; string search_item( "Alain de Botton" ); // int number = authorscount( search_item ); multimap< string,string >::iterator iter; iter = authorsfind( search_item ); for ( int cnt = 0; cnt < number; ++cnt, ++iter ) do_something( *iter ); // }
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An alternative, somewhat more elegant strategy is to use the pair of iterator values returned by the special multiset and multimap operation, equal_range() If the value is present, the first iterator points to the first instance of the value and the second iterator points 1 past the last instance of the value If the last instance is the last element of the multiset, the second iterator is set equal to end() For example:
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#include <map> #include <string> #include <utility> void code_fragment() { multimap< string, string > authors; // string search_item( "Haruki Murakami" ); while ( cin && cin >> search_item ) switch ( authorscount( search_item )) { // none present, go to the next item case 0: break; // single item ordinary find() case 1: { multimap< string,string >::iterator iter; iter = authorsfind( search_item ); // do something with element break;
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} // multiple entries present default: { typedef multimap< string,string >::iterator iterator; pair< iterator, iterator > pos; // posfirst addresses first occurrence // possecond addresses position in which // value no longer occurs pos = authorsequal_range( search_item ); for ( ; posfirst != possecond; posfirst++ ) // do something with each element } } }
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Insertion and deletion are the same as for the simpler map and set associative container types equal_range() is useful for providing the iterator pair necessary to mark the range of multiple elements to be erased For example:
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#include <multimap> #include <string> typedef multimap< string, string >::iterator iterator; pair< iterator, iterator > pos; string search_item( "Kazuo Ishiguro" ); // authors is a multimap<string,string> // this is equivalent to // authorserase( search_item ); pos = authorsequal_range( search_item ); authorserase( posfirst, possecond );
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Insertion adds an additional element each time For example:
typedef multimap<string,string>::value_type valType; multimap<string,string> authors; // introduces a first key under Barth authorsinsert( valType( string( "Barth, John" ), string( "Sot-Weed Factor" ))); // introduces a second key under Barth authorsinsert( valType( string( "Barth, John" ), string( "Lost in the Funhouse" )));
One constraint on access of an element of a multimap is that the subscript operator is not supported For example, the following