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There is an Alignment Issue and Extra Spacing in my code, but I cannot figure out where?

February 6, 2022

I have been working on a project. I am limited to using a few libraries so any additional library would not be helpful. I am building a calendar and so far my calendar works, but each time – after the number becomes double digits on the second row – there is a shift
and my calendar doesn’t align neatly on top of the next row. I can not figure out where the spacing issue allows this to happen. Also, I am noticing an extra space after the last number when the calendar is finished. How do I fix this alignment issue and the extra spacing issue? please help! Here’s an example picture of the output.
UPDATE: Thanks Drew for helping me with the alignment! However, I now face the issue of one extra spacing at the end. How do I fix that?

#include <iostream>

int month, day, year, start = 0;

#define MONTHS_PER_YEAR 12

const unsigned short DAYS_PER_MONTH[MONTHS_PER_YEAR] =
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

const char MONTH_NAMES[MONTHS_PER_YEAR][10] =
{"January",   "February", "March",    "April",
"May",       "June",     "July",     "August",
"September", "October",  "November", "December"};

/**
 * Returns true if indicated year is a leap year.
 * @param year: the year that user inputs.
 * @return true if year is a leap year, and false otherwise.
 */
bool leapYear(int year)
{
    return (((year % 400) == 0) || ((year % 4 == 0) && !(year % 100 == 0)));
}

/**
 * Iterates through months Janauray and February to find the starting day of
 *the month following the Gregorian caledner.
 * @returns extra day for leap year or not.
 */
int day_of()
{
   int subset_days[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
   if (month < 3)
   {
      year--;
   }
   return ((year + year / 4 - year / 100 + year / 400 + subset_days[month - 1] + day) % 7);
}

/**
 * Prints the calender and calculates how many days are in month and which months
 * day starts on.
 */
void printMonth()
{
   start = day_of();
   int count = 0;
   int days_per = DAYS_PER_MONTH[month - 1];
   if (leapYear(year + 1) && month == 2)
   {
     days_per = DAYS_PER_MONTH[month - 1] + 1;
   }
   if (start == 6)
   {
      start = -1;
      std::cout << " ";
   }
   for (count = 0; count <= start; count++)
   {
      if (count > 0)
      {
         std::cout << "   ";
      }
      else
      {
         std::cout << "    ";
      }
   }
   for (day = 1; day <= days_per; day++)
   {
      if (++count > 6)
      {
         count = 0;
         if (day > 9)
         {
            std::cout << day << '\n';
         }
         else
         {
            std::cout << day << '\n' << " ";
         }
      }
      else
      {
         if (day > 9)
         {
            std::cout << day;
         }
         else 
            std::cout << day << " ";
            std::cout << " ";
      }
   }
   std::cout << std::endl;
}

// Controls operation of the program.
int main()
{
   std::cout << "Enter the month: ";
   std::cin >> month;
   std::cout << "Enter the year: ";
   std::cin >> year;
   std::cout << MONTH_NAMES[month - 1] << " " << year << std::endl;
   std::cout << "Su" << "  "<< "M" << "  "<< "T"<< "  " << "W" << " " << "Th" << "  " << "F" << " " << "Sa\n";
   printMonth();
   return 0;
}