My-first-project-with-C-plus-plus/PrintCalendar.cpp at master · Dersalik/My-first-project-with-C-plus-plus · GitHub

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#include<iostream>
#include<iomanip>
using namespace std;

void printMonth(int year, int month);
void printMonthTitle(int year, int month);
void printMonthName(int month);
void printMonthBody(int year, int month);
int getStartDay(int year, int month);
int getTotalNumberOfDays(int year, int month);
int getNumberOfDaysInMonth(int year, int month);
bool isLeapYear(int year);
int main()
{
    cout << "Enter full year (e.g., 2001): ";
    int year;
    cin>>year;

    cout << "Enter month in number between 1 and 12: ";
    int month;
    cin>>month;
    printMonth(year, month);
    return 0;
}

void printMonth(int year, int month)
{
  printMonthTitle(year, month);
  printMonthBody(year, month);
}

void printMonthTitle(int year, int month)
{
   printMonthName(month);
   cout << " " << year << endl;
   cout << "-----------------------------" << endl;
   cout << " Sun Mon Tue Wed Thu Fri Sat" << endl;
}

void printMonthName(int month)
{
    switch (month)
    {
    case 1:
        cout<<"january ";
        break;
    case 2:
        cout<<"february";
        break;
    case 3:
        cout<<"march";
        break;

    case 4:
        cout<<"april";
        break;
    case 5:
        cout<<"may";
        break;
    case 6:
        cout<<"june";
        break;
    case 7:
        cout<<"july";
        break;
    case 8:
        cout<<"august";
        break;
    case 9:
        cout<<"september";
        break;
    case 10:
    cout<<"october";
     break;
    case 11:
        cout<<"november";
        break;
    case 12:
        cout<<"december";

    }
}

void printMonthBody(int year, int month)
{
   int startDay = getStartDay(year, month);
   int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month);
   int i=0;
   for(i=0;i>startDay;i++)
    cout<<"  ";
for (i = 1; i <= numberOfDaysInMonth; i++)
{
    cout << setw(4) << i;
    if ((i + startDay) % 7 == 0)
        cout << endl;
}

}

int getStartDay(int year, int month)
{
   int startDay1800 = 3;
   int totalNumberOfDays = getTotalNumberOfDays(year, month);
   return (totalNumberOfDays + startDay1800) % 7;
}

int getTotalNumberOfDays(int year, int month)
{
    int total=0;
    for (int i = 1800; i < year; i++)
    if (isLeapYear(i))
       total = total + 366;
    else
        total = total + 365;

    for (int i = 1; i < month; i++)
        total = total + getNumberOfDaysInMonth(year, i);
    return total;
}

int getNumberOfDaysInMonth(int year, int month)
{
    if (month == 1 || month == 3 || month == 5 || month == 7 ||month == 8 || month == 10 || month == 12)
        return 31;
    if (month == 4 || month == 6 || month == 9 || month == 11)
        return 30;
    if (month == 2) return isLeapYear(year) ? 29 : 28;
    return 0;
}

bool isLeapYear(int year)
{
return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
}