Calander Help

[Bayan Khorshidi Berkeley]

Hello, I can't seem to fix this part of the program. I am trying to fix it so that when the output comes out, the name of the month, for example "may" or "june" is aligned in the middle, not the left of the program. I am having major trouble with this part of the program.

Also my other problem is that I don't know how to add the friendly user message if a person enters an invalid date. For example, if they enter an invalid date such as (20 20 2016) then it should give me a user friendly error message, but I can't seem to add it without having like 20 errors. Any help is appreciated.

This is the assignment "write a program that will be able to print the calendar for any month requested by the user. For example, in the following example, the user requests the month for the date 5/20/2016. Any help is appreciated again, thanks a bunch. I managed to get most of it.

#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
#include <string>
#include <sstream>


using namespace std;


int calcDaysSoFar(int year, int month);
bool isLeapYear(int year);
void printCalendar(int month, int year, int firstDay);
void printGridTop(int innerWidth);
void repeatChar(char ch, int numChar);
void drawDivider(int innerWidth);
void printGridBottom(int innerWidth);



const int firstYear = 1800;
const int dayOffset = 3;
const int firstLeapYear = 1804;

string dayNames[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };

string  months[] = { "January", "February", "March", "April", "May", "June", "July", "August",
"September", "October", "November", "December" };

int daysInMonth[] = { 31,28,31,30,31,30,31,31,30,31,30,31 };

int daysPassed[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };


int main()

{

	int year, month;
	int days;

	cout << "Please enter the number of the month and year to access calendar\n" << endl;
	cout << "Please leave a space in between the month and year when you enter them: \n";

	cin >> month >> year;


	days = calcDaysSoFar(year, month);
	int firstDayOfWeek = days % 7;

	printCalendar(month, year, firstDayOfWeek);


	system("pause");

}



int calcDaysSoFar(int year, int month)
{
	int days;


	days = (year - firstYear) * 365;
	days += dayOffset;
	days += daysPassed[month - 1];


	for (int count = firstLeapYear; count < year; count += 4)
	{
		if (isLeapYear(count))
		{
			days++;
		}
	}


	if (month > 2 && isLeapYear(year))
	{
		days++;
	}

	return days;

}



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



void printCalendar(int month, int year, int firstDay)
{
	string dayHeader = string("Sun ") + char(186) + "Mon " + char(186) + "Tue " + char(186) +
		"Wed " + char(186) + "Thu " + char(186) + "Fri " + char(186) + "Sat ";

	int innerWidth = dayHeader.length();
	stringstream sstream;
	string tempStr;

	cout << '\n';
	printGridTop(innerWidth);


	sstream << year;
	tempStr = string(" ") + months[month - 1] + string("     ") + sstream.str();
	cout << char(186);
	cout << tempStr;
	repeatChar(' ', innerWidth - tempStr.length());
	cout << char(186);


	cout << '\n';
	cout << char(204);
	for (int count = 0; count < 7; count++)
	{
		repeatChar(char(205), 4);
		if (count != 6)
		{
			cout << char(203);
		}
	}
	cout << char(185);
	cout << '\n';



	cout << char(186);
	cout << dayHeader;

	cout << char(186) << '\n';

	drawDivider(innerWidth);

	int count, offset;
	offset = 1 - firstDay;

	count = daysInMonth[month - 1];


	if (isLeapYear(year) && (month == 2))
	{
		count++;
	}


	int dayNum;
	for (int x = offset; x <= count; x += 7)
	{

		cout << char(186);
		for (dayNum = x; (dayNum < x + 7); dayNum++)
		{
			if (dayNum <= 0 || dayNum > count)
			{
				cout << setw(4) << left << setprecision(3) << "    " << char(186);;
			}
			else
			{
				cout << setw(4) << left << setprecision(3) << setfill(' ') << dayNum << char(186);
			}

		}
		cout << '\n';
		if (dayNum <= count)
		{

			drawDivider(innerWidth);
		}
	}

	printGridBottom(innerWidth);

}



void printGridTop(int innerWidth)
{
	cout << char(201);
	repeatChar((char)205, innerWidth);
	cout << char(187);
	cout << '\n';

}


void repeatChar(char ch, int numChar)
{
	string aStr(numChar, ch);
	cout << aStr;
}


void drawDivider(int innerWidth)
{
	cout << char(204);
	for (int count = 0; count < 7; count++)
	{
		repeatChar(char(205), 4);
		if (count != 6)
		{
			cout << char(206);
		}
	}
	cout << char(185);
	cout << '\n';
}


void printGridBottom(int innerWidth)
{
	cout << char(200);
	for (int count = 0; count < 7; count++)
	{
		repeatChar(char(205), 4);
		if (count != 6)
		{
			cout << char(202);
		}
	}
	cout << char(188);
	cout << '\n';
}