get_print.cpp
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上传日期:2022-06-29
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书籍源码
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Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #include "Query.h"
- #include "TextQuery.h"
- #include <string>
- #include <set>
- #include <iostream>
- #include <fstream>
- using std::set;
- using std::string;
- using std::cerr;
- using std::cout;
- using std::cin;
- using std::ifstream;
- using std::endl;
- TextQuery build_textfile(const string &filename)
- {
- // get a file to read from which user will query words
- ifstream infile;
- if (!open_file(infile, filename)) {
- cerr << "No input file!" << endl;
- return TextQuery();
- }
- TextQuery ret;
- ret.read_file(infile); // builds query map
- return ret; // builds query map
- }
- bool get_word(string &s1)
- {
- cout << "enter a word to search for, or q to quit: ";
- cin >> s1;
- if (!cin || s1 == "q") return false;
- else return true;
- }
- bool get_words(string &s1, string &s2)
- {
- // iterate with the user: prompt for a word to find and print results
- cout << "enter two words to search for, or q to quit: ";
- cin >> s1;
- // stop if hit eof on input or a "q" is entered
- if (!cin || s1 == "q") return false;
- cin >> s2;
- return true;
- }
- void print_results(const set<TextQuery::line_no>& locs, const TextQuery &file)
- {
- // report no matches
- if (locs.empty()) {
- cout << "nSorry. There are no entries for your query."
- << "nTry again." << endl;
- return;
- }
- // if the word was found, then print count and all occurrences
- set<TextQuery::line_no>::size_type size = locs.size();
- cout << "match occurs "
- << size << (size == 1 ? " time:" : " times:") << endl;
- // print each line in which the word appeared
- set<TextQuery::line_no>::const_iterator it = locs.begin();
- for ( ; it != locs.end(); ++it) {
- cout << "t(line "
- // don't confound user with text lines starting at 0
- << (*it) + 1 << ") "
- << file.text_line(*it) << endl;
- }
- }