C + +-implementation calculation today is xx xx month xx day week x xx years xx month xx days is the day of the week?

Code:

#include <iostream> #include <string> #include <vector>using namespace std;int hashmapping (int mouth)    {vector<int> days{31,28,31,30,31,30,31,31,30,31,30,31}; return days[mouth-1];} int isleapyear (int year, int mouth) {if ((year%4 = = 0 && year%100! = 0) | | (year%400 = = 0))    && mouth = = 2) {return hashmapping (mouth) + 1; } return hashmapping (mouth);}    int calculatedays (int start_year, int end_year, int start_mouth, int end_mouth) {int days = 0; if (End_mouth >= start_mouth) {if (Start_year < end_year) {for (int i = start_year; I < End_year;                i++) {for (int j = Start_mouth, J <=, J + +) days + = Isleapyear (i, j);            for (int j = 1; J <= End_mouth; j + +) days + = Isleapyear (i, j); }} else {for (int j = Start_mouth; J <= End_mouth; j + +) days + =Isleapyear (Start_year, J); }} else {for (int i = start_year; i < end_year; i++) {for (int j = Start_mouth; j <= 12;            J + +) days + = Isleapyear (i, j);        for (int j = 1; J <= End_mouth; j + +) days + = Isleapyear (i, j); }} return days;}    string Hashfunc (int days, int week) {vector<string> str{"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"}; Return str[(week-1 + days%7)%7];} void PrintWeek (int start_year, int start_mouth, int start_day, int week, int end_year, int end_mouth, int end_day) {str    ing we;    int days; Switch (week) {Case 1:days = calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_da            Y + isleapyear (end_year, End_mouth)-end_day);            we = Hashfunc (days, week);        Break Case 2:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + isleapyear (end_year, End_mouth)-End_dAY);            we = Hashfunc (days, week);        Break Case 3:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + isleapyear (end_year,            End_mouth)-End_day);            we = Hashfunc (days, week);        Break Case 4:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + isleapyear (end_year,            End_mouth)-End_day);            we = Hashfunc (days, week);        Break Case 5:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + isleapyear (end_year,            End_mouth)-End_day);            we = Hashfunc (days, week);        Break Case 6:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + isleapyear (end_year,            End_mouth)-End_day);            we = Hashfunc (days, week);        Break Case 7:days = Calculatedays (Start_year, End_year, Start_mouth, End_mouth)-(Start_day + Isleapyear (End_year, End_mouth)-end_day);            we = Hashfunc (days, week);    Break } cout << start_year << '/' << start_mouth << '/' << start_day << ' ~ ' &LT;&L T End_year << ' << end_mouth << '/' << end_day << ' total: ' << days << ' Day '    << Endl; cout << end_year << "year" << End_mouth << "month" << end_day << "Day is" << we << en DL;}    int main () {int start_year, start_mouth, Start_day;    int end_year, End_mouth, End_day;    Int week;    cout << "Please enter the starting year/month/day and Days of the week:" << Endl;    Cin >> Start_year;    Cin >> Start_mouth;    Cin >> Start_day;    CIN >> Week;    cout << "Please enter end of year/month/day:" << Endl;    Cin >> End_year;    Cin >> End_mouth;    Cin >> End_day;    PrintWeek (Start_year, Start_mouth, Start_day, week, End_year, End_mouth, End_day); return 0;}

Operation Result:

C + +-implementation calculation today is xx xx month xx day week x xx years xx month xx days is the day of the week?