C++ Primer Chapter 10 关联容器之set & mutimap

#if 0//Chapter 10 Exercise 10.24//此程序在dos下输入test.exe exfile.txt//exfile.txt 中存放的是排除集单词#include <iostream>#include <set>#include <string>#include <fstream>using namespace std;ifstream& open_file(ifstream& in, const string& file){in.close();in.clear();in.open(file.c_str());//由于历史原因呢，IO标准库使用的C风格字符串而不是C++string类型的字符串作为文件名return in;}int main(int argc, char **argv){if (argc != 2){throw runtime_error("input error");}ifstream excludedfile;if (!open_file(excludedfile, argv[1])){throw runtime_error("no input file");}set<string> excluded;string excluded_word;while (excludedfile >> excluded_word){excluded.insert(excluded_word);}string word;while(cin >> word){if (excluded.count(word) || *(word.end() - 1) != 's'){cout << word << endl;}else{word.resize(word.size() - 1);cout << word << endl;}}}#endif#if 0//Chapter 10 Exercise 10.25#include <iostream>#include <vector>#include <string>#include <set>#include <ctime>#include <cstdlib>using namespace std;int main(){vector<string> books;set<string> readedbooks;cout << "Enter the books you want to read(Ctrl + z to end)" << endl;string name;while (getline(cin, name))//一行一个书名{books.push_back(name);}cin.clear();srand((unsigned)time(NULL));bool timeOver = false;string answer, bookname;while (!timeOver && !books.empty()){cout << "Would you like to read a book? (Yes/No)" << endl;cin >> answer;if (answer[0] == 'Y' || answer[0] == 'y'){int i = rand() % books.size();bookname = books[i];cout << "You can read this book:\t" << bookname << endl;books.erase(books.begin() + i);readedbooks.insert(bookname);cout << "Did you read it?(Yes/No)" << endl;cin >> answer;if (answer[0] == 'N' || answer[0] == 'n'){readedbooks.erase(bookname);books.push_back(bookname);}}cout << "Time over?(Yes/No)" << endl;cin >> answer;if (answer[0] == 'Y' || answer[0] == 'y'){timeOver = true;}}if (timeOver){cout << "books read: " << endl;for (set<string>::iterator iter = readedbooks.begin(); iter != readedbooks.end(); ++iter){cout << *iter << endl;}cout << "books not read: " << endl;for (vector<string>::iterator iter = books.begin(); iter != books.end(); ++iter){cout << *iter << endl;}}if (books.empty()){cout << "Congratulations! You have read all these books." << endl;}system("pause");return 0;}#endif#if 0//Chapter 10 Exercise 10.26#include <iostream>#include <map>#include <string>using namespace std;int main(){multimap<string, string> author;string name, book;do {cout << "Enter author's name(Ctrl + z to end)" << endl;cin >> name;if (!cin){break;}cout << "Enter author's works(Ctrl + z to end)" << endl;while(cin >> book){author.insert(make_pair(name, book));}cin.clear();} while (cin);cin.clear();cout << "Enter the author you want to erase: " << endl;string searchauthor;cin >> searchauthor;multimap<string, string>::iterator iter = author.find(searchauthor);if (iter != author.end()){author.erase(searchauthor);}elsecout << "Can not find this author" << endl;cout << "author\t\tbook:" << endl;for (iter = author.begin(); iter != author.end(); ++iter){ cout << iter->first << "\t\t" << iter->second << endl;}return 0;}#endif