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Commit 2bb0c9a

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Exercise 23.11; Exercise 23.12
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‎Chapter_23/C23_Exercise_23.11.cpp

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/* Exercise 23.11 */
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#include<iostream>
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#include<istream>
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#include<fstream>
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#include<sstream>
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#include<iomanip>
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#include<string>
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#include<vector>
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#include<map>
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#include<regex>
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#include"C23_Exercise_23.11.h"
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using namespace std;
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inline void error(string s) { throw runtime_error(s); }
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inline void error(const string& s, const string& s2) { error(s + s2); }
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inline void error(const string& s, int i) { ostringstream os; os << s << ": " << i; error(os.str()); }
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inline void keep_window_open() { char ch; cin >> ch; }
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int main()
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{
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enum Action {
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EXIT = -1, PRINTACTIONLIST,
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CASE1, CASE2, CASE3, CASE4, CASE5
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};
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const string actionList = "\tList of actions:\n"
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" (1) Number of students\n"
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" (-1) Exit, (0) Print the list of actions\n";
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cout << actionList;
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int action;
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bool cond{ true };
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while (cond) try {
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cout << "\nPlease enter the action: ";
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if (!(cin >> action)) { ClearInput(cin); error("Error. Incorrect input"); }
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char ch;
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cin.get(ch);
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switch (action) {
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case CASE1: {
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cout << endl;
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ifstream ifs{ "C23_Exercise_23.9_table.txt" };
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if (!ifs) error("Error. File opening error");
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ofstream ofs{ "C23_Exercise_23.11_table_students.txt" };
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if (!ofs) error("Error. File opening error");
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string first;
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size_t lineNum = 0;
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regex header{ R"(^[\w ]+(\t[\w ]+)*$)" }; // header line
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regex row{ R"(^([\w ]+)(\t\d+)(\t\d+)(\t\d+)$)" }; // data line
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if (getline(ifs, first)) { // check header line
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smatch matches;
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if (!regex_match(first, matches, header)) {
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error("Error. No header");
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}
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}
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string line;
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string last;
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map<string, SchoolClass> classes;
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while (true) {
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++lineNum;
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getline(ifs, line);
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if (!ifs) {
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if (ifs.eof() && line.size() == 0) break;
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else error("Error. Read error");
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}
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smatch matches;
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if (!regex_match(line, matches, row)) cerr << "bad line: " << lineNum << '\n';
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if (matches[1] == "Alle klasser") {
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last = line;
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break;
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}
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string classNum;
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string temp = matches[1];
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for (int i = 0; i < temp.size(); ++i) {
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if (isdigit(temp[i])) classNum += temp[i];
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else {
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if (i == 0) classNum = temp;
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break;
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}
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}
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int curr_boy = from_string<int>(matches[2]);
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int curr_girl = from_string<int>(matches[3]);
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int curr_total = from_string<int>(matches[4]);
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if (curr_boy + curr_girl != curr_total) error("bad row sum\n");
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SchoolClass& cl = classes[classNum];
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cl.boys += curr_boy;
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cl.girls += curr_girl;
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cl.total += curr_total;
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}
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vector<pair<int, map<string, SchoolClass>::iterator>> classNumbers;
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vector<map<string, SchoolClass>::iterator> others;
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for (auto it = classes.begin(); it != classes.end(); ++it) {
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string s = it->first;
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string digits;
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for (int i = 0; i < s.size(); ++i) {
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if (isdigit(s[i])) digits += s[i];
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else break;
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}
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if (digits.size() == 0) {
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others.push_back(it);
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continue;
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}
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int num = 0;
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istringstream iss{ digits };
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iss >> num;
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classNumbers.push_back(pair<int, map<string, SchoolClass>::iterator>{ num, it });
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}
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sort(classNumbers.begin(), classNumbers.end(),
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[](pair<int, map<string, SchoolClass>::iterator> pair1,
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pair<int, map<string, SchoolClass>::iterator> pair2)
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{ return pair1.first < pair2.first; });
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ofs << first << "\tFORSKEL" << endl;
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for (int i = 0; i < classNumbers.size(); ++i) {
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ofs << classNumbers[i].second->first
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<< '\t' << classNumbers[i].second->second.boys
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<< '\t' << classNumbers[i].second->second.girls
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<< '\t' << classNumbers[i].second->second.total
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<< '\t';
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if (i == 0) ofs << "-" << endl;
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else {
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int dif = classNumbers[i].second->second.total - classNumbers[i - 1].second->second.total;
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ofs.setf(ios_base::showpos);
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ofs << dif << endl;
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ofs.unsetf(ios_base::showpos);
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}
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}
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for (int i = 0; i < others.size(); ++i) {
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ofs << others[i]->first << '\t' << others[i]->second.boys
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<< '\t' << others[i]->second.girls << '\t' << others[i]->second.total
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<< "\t-" << endl;
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}
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ofs << last << "\t-";
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cout << vsp_2;
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break;
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}
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case PRINTACTIONLIST:
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cout << actionList;
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break;
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case EXIT:
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cond = false;
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break;
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default:
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error("Error. Incorrect action number");
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break;
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}
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}
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catch (runtime_error& e) {
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cerr << e.what() << endl;
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}
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catch (...) {
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cerr << "Error. Exception\n";
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return 1;
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}
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return 0;
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}
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void ClearInput(istream& is)
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{
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is.clear();
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is.ignore(numeric_limits<streamsize>::max(), '\n');
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}

‎Chapter_23/C23_Exercise_23.11.h

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/* Exercise 23.11 */
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using namespace std;
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const char* sp_2 = " ";
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const char* sp_4 = " ";
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const char* sp_6 = " ";
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const char* sp_8 = " ";
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const char* vsp_2 = "\n\n";
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const char* vsp_3 = "\n\n\n";
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const char* vsp_4 = "\n\n\n\n";
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void ClearInput(istream& is);
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struct bad_from_string : std::bad_cast { // class for reporting string cast errors
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const char* what() const override
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{
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return "bad cast from string";
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}
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};
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template<typename T> T from_string(const string& s)
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{
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istringstream is{ s };
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T t;
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if (!(is >> t)) throw bad_from_string{};
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return t;
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}
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struct SchoolClass {
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int boys;
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int girls;
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int total;
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SchoolClass() : boys{ 0 }, girls{ 0 }, total{ 0 } {}
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};

‎Chapter_23/C23_Exercise_23.12.cpp

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/* Exercise 23.12 */
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#include<iostream>
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#include<istream>
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#include<fstream>
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#include<sstream>
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#include<iomanip>
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#include<string>
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#include<vector>
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#include<regex>
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#include"C23_Exercise_23.12.h"
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using namespace std;
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inline void error(string s) { throw runtime_error(s); }
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inline void error(const string& s, const string& s2) { error(s + s2); }
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inline void error(const string& s, int i) { ostringstream os; os << s << ": " << i; error(os.str()); }
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inline void keep_window_open() { char ch; cin >> ch; }
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int main()
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{
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enum Action {
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EXIT = -1, PRINTACTIONLIST,
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CASE1, CASE2, CASE3, CASE4, CASE5
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};
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const string actionList = "\tList of actions:\n"
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" (1) Reformat to ISO date\n"
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" (-1) Exit, (0) Print the list of actions\n";
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cout << actionList;
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int action;
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bool cond{ true };
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while (cond) try {
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cout << "\nPlease enter the action: ";
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if (!(cin >> action)) { ClearInput(cin); error("Error. Incorrect input"); }
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char ch;
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cin.get(ch);
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switch (action) {
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case CASE1: {
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cout << endl;
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cout << sp_2 << "Please enter a file name: ";
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string fileName;
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getline(cin, fileName);
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if (!cin) error("Error. Incorrect input");
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ifstream ifs{ fileName };
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if(!ifs) error("Error. File opening error");
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ofstream ofs{ "C23_Exercise_23.12_reformat.txt" };
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if (!ofs) error("Error. File opening error");
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while (true) {
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string s;
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getline(ifs, s);
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if (!ifs) {
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if (ifs.eof()) break;
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else error("Error. Read error");
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}
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ReformatDateToISO(ofs, s);
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}
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cout << vsp_2;
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break;
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}
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case PRINTACTIONLIST:
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cout << actionList;
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break;
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case EXIT:
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cond = false;
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break;
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default:
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error("Error. Incorrect action number");
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break;
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}
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}
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catch (runtime_error& e) {
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cerr << e.what() << endl;
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}
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catch (...) {
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cerr << "Error. Exception\n";
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return 1;
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}
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return 0;
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}
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void ClearInput(istream& is)
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{
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is.clear();
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is.ignore(numeric_limits<streamsize>::max(), '\n');
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}
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void ReformatDateToISO(ostream& os, const string& s)
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{
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constexpr int nPatterns = 4;
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constexpr int nDigitInYear = 4;
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constexpr int nDigitInMonth = 2;
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constexpr int nDigitInDay = 2;
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/* date pattern:
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dd/mm/yyyy OR dd-mm-yyyy OR dd.mm.yyyy OR
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mm/dd/yyyy OR mm-dd-yyyy OR mm.dd.yyyy OR
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yyyy/mm/dd OR yyyy-mm-dd OR yyyy.mm.dd OR
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yyyy/dd/mm OR yyyy-dd-mm OR yyyy.dd.mm
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*/
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string db{ R"((^|\s|$))" }; // date boundary
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string sep{ R"([./-])" }; // separator list
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string d{ R"((0?[1-9]|[12]\d|3[01]))" }; // day: D or DD
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string m{ R"((0?[1-9]|1[0-2]))" }; // month: M or MM
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string y{ R"((\d{4}))" }; // year: YYYY
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constexpr int sepGroupBegin = 1;
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constexpr int sepGroupEnd = 5;
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vector<regex> pattern(nPatterns);
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vector<PatternGroup> pg(nPatterns);
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pattern[0] = regex{ db + d + sep + m + sep + y + db };
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pg[0] = PatternGroup{ 4, 3, 2 };
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pattern[1] = regex{ db + m + sep + d + sep + y + db };
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pg[1] = PatternGroup{ 4, 2, 3 };
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pattern[2] = regex{ db + y + sep + m + sep + d + db };
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pg[2] = PatternGroup{ 2, 3, 4 };
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pattern[3] = regex{ db + y + sep + d + sep + m + db };
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pg[3] = PatternGroup{ 2, 4, 3 };
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string line = s;
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for (int i = 0; i < nPatterns; ++i) {
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string formatted;
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string::const_iterator itFirst = line.begin();
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string::const_iterator itLast = line.end();
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while (true) {
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smatch matched;
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if (!regex_search(itFirst, itLast, matched, pattern[i])) {
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formatted += string{ itFirst, itLast };
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break;
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}
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formatted += string{ itFirst, matched[0].first };
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formatted += string{ matched[sepGroupBegin].first, matched[sepGroupBegin].second };
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formatted += string{ matched[pg[i].y] };
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formatted += '-';
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if (matched[pg[i].m].second - matched[pg[i].m].first < nDigitInMonth) {
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formatted += '0';
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}
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formatted += string{ matched[pg[i].m] };
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formatted += '-';
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if (matched[pg[i].d].second - matched[pg[i].d].first < nDigitInDay) {
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formatted += '0';
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}
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formatted += string{ matched[pg[i].d] };
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formatted += string{ matched[sepGroupEnd].first, matched[sepGroupEnd].second };
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itFirst = matched.suffix().first;
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}
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line = formatted;
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}
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os << line << endl;
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}

‎Chapter_23/C23_Exercise_23.12.h

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/* Exercise 23.12 */
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using namespace std;
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const char* sp_2 = " ";
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const char* sp_4 = " ";
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const char* sp_6 = " ";
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const char* sp_8 = " ";
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const char* vsp_2 = "\n\n";
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const char* vsp_3 = "\n\n\n";
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const char* vsp_4 = "\n\n\n\n";
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void ClearInput(istream& is);
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void ReformatDateToISO(ostream& os, const string& s);
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struct bad_from_string : std::bad_cast { // class for reporting string cast errors
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const char* what() const override
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{
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return "bad cast from string";
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}
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};
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template<typename T> T from_string(const string& s)
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{
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istringstream is{ s };
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T t;
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if (!(is >> t)) throw bad_from_string{};
29+
return t;
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}
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struct PatternGroup {
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int y;
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int m;
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int d;
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PatternGroup() : y{ 0 }, m{ 0 }, d{ 0 } {}
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PatternGroup(int year, int month, int day) : y{ year }, m{ month }, d{ day } {}
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};

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