"C + + Primer Fifth Edition" Exercise 9.51 Reference answer

Date.h#include <map> #include <string> #include <vector>using namespace Std;struct date{         explicit Date (const string & info) {//Detect input format, attempt to initialize, errorinit  if failed            if (Mymap.empty ()) {               Initmap ();            }            if (!checkinfoformat (info) ) {               ErrorInit ();                return;            }            String Monthstr=info.substr (0,info.find_first_of (",/"));           & nbsp; String Daystr=info.substr (Info.find_first_of (",/") +1,info.find_last_of (",/")-info.find_first_of (",/")-1);             string Yearstr=info.substr (Info.find_last_of (",/") + 1,info.size ());            if (!tryToInit ({yearStr, MONTHSTR,DAYSTR})) {                Errorinit ();           }              cout<< "Year:" <<year<<endl;              cout<< "Month:" <<month<<endl;              cout<< "Day:" <<day<<endl;        }        unsigned year;         unsigned month;        unsigned day;         static void Initmap ();        private:            bool Checkdate () {//check date is legal              if (year>10000| | month>12| | DAY&GT;31)              return false;              if (month==4| | month==6| | month==9| | month==11) {               if (day>30)                return false;             }              if (month==2) {              if (checkyear (year) &&day>29) {               return false;              }               IF (!checkyear (year) &&day>28)                return false;            }              return true;           }           BOOL Checkyear ( Unsigned year)//detect leap years            {return ((year% 4 = = 0) && ( Year% 100 = 0)) | | (Year% 400 = = 0)) ? true:false;          }&NBsp;          Static map<string,unsigned> mymap;            void Errorinit ()             {                year=1970;                month=1;                 day=1;           }                      bool Trytoinit (const vector<string> & Data)//attempt to initialize            {                try{                  Year=stoul (data[0]);                  Day=stoul (data[2]);               }catch (invalid_argument & Error) {                  return false;               }                try{                  Month=stoul (data[1]);               }catch (invalid_argument & Error) {                   if (Mymap.find (data[1]) ==mymap.end ())                    return false;                   month=mymap[data[1]];               }                return checkdate ();          }            bool Checkinfoformat (const string & Info)//detection format is correct            {               if (Info.empty ())                 return false;               if (info.find_first_of (",/") ==info.size ())                 return false;              if ( Info.find_first_of (",/") ==info.find_last_of (",/"))                 return false;                return true;          }};

Date.cppmap<string,unsigned> date::mymap;void Date::initmap () {Mymap.insert (make_pair<string,u                  Nsigned> ("January", 1));                  Mymap.insert (make_pair<string,unsigned> ("Jan", 1));                  Mymap.insert (Make_pair<string,unsigned> ("February", 2));                  Mymap.insert (make_pair<string,unsigned> ("Feb", 2));                  Mymap.insert (make_pair<string,unsigned> ("March", 3));                  Mymap.insert (make_pair<string,unsigned> ("Mar", 3));                  Mymap.insert (make_pair<string,unsigned> ("April", 4));                  Mymap.insert (make_pair<string,unsigned> ("APR", 4));                  Mymap.insert (Make_pair<string,unsigned> ("may", 5));                  Mymap.insert (make_pair<string,unsigned> ("June", 6));                  Mymap.insert (make_pair<string,unsigned> ("June", 6));                  Mymap.insert (make_pair<string,unsigned> ("July", 7)); Mymap.insERT (make_pair<string,unsigned> ("Jul", 7));                  Mymap.insert (Make_pair<string,unsigned> ("August", 8));                  Mymap.insert (Make_pair<string,unsigned> ("8)");                  Mymap.insert (make_pair<string,unsigned> ("September", 9));                  Mymap.insert (make_pair<string,unsigned> ("Sep", 9));                  Mymap.insert (Make_pair<string,unsigned> ("October", 10));                  Mymap.insert (make_pair<string,unsigned> ("Oct", 10));                  Mymap.insert (make_pair<string,unsigned> ("November", 11));                  Mymap.insert (make_pair<string,unsigned> ("Nov", 11));                  Mymap.insert (make_pair<string,unsigned> ("December", 12));            Mymap.insert (make_pair<string,unsigned> ("Dec", 12)); Application of}//Table driving method

Unify the time to 1970 1 1 when any special case is encountered