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adding the totals of functions in main

justStarting (30)
I am still learning the function calls and I seem to be stuck when trying to add other functions together. I just want to add what the function is returning but I don't know how to get around the parameters which seems to make it not work properly.

I just need the dayofweek var to work by adding all the rest of the functions. I feel very close but I just can't seem to get it.
thanks for any help

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 #include <iostream>
using namespace std;

bool isLeapYear(int);
int getCenturyValue(int);
int getYearValue(int);
int getMonthValue(int, int);


int main()
{
	char choice;
	int month, day, year;
	int dayofweek;

	do
	{
		cout << "Enter a date in the form month day year, eg 4 24 1939 \n";
		cin >> month >> day >> year;

		//loop to not allow imporper dates
		while (month > 12 || month < 0 || day >31 || day < 0 || year > 2018 || year < 0)
		{
			cout <<"Invalid date" << endl;
			cout << "Enter a date in the form month day year, eg 4 24 1939 \n";
			cin >> month >> day >> year;
		}
		isLeapYear(year);
		getCenturyValue(year);
		getYearValue(year);
		getMonthValue(month, year);

		// calculating the day of the week given the totals from other functions
		dayofweek = (day + getMonthValue(month,year) + getYearValue(year) + getCenturyValue(year))%7;
		
		// if statement to show day of week given the total
		if (dayofweek = 0)
			cout << month << "/" << day << "/" << year << "/" << " is a Sunday" << endl;
		else if (dayofweek = 1)
			cout << month << "/" << day << "/" << year << "/" << " is a Monday" << endl;
		else if (dayofweek = 2)
			cout << month << "/" << day << "/" << year << "/" << " is a Tuesday" << endl;
		else if (dayofweek = 3)
			cout << month << "/" << day << "/" << year << "/" << " is a Wednesday" << endl;
		else if (dayofweek = 4)
			cout << month << "/" << day << "/" << year << "/" << " is a Thursday" << endl;
		else if (dayofweek = 5)
			cout << month << "/" << day << "/" << year << "/" << " is a Friday" << endl;
		else if (dayofweek = 6)
			cout << month << "/" << day << "/" << year << "/" << " is a Saturday" << endl;
		
		// runs another day of week when user enters "Y/y"
		cout << "Do you want to simulate again? <Y or N>"; 
		cin >> choice;
	} while (choice == 'Y' || choice == 'y');
	cout << "Thanks for playing!" << endl;


	return 0;
}

//bool statment for leap year
bool isLeapYear(int year)
{
	bool LeapYear = false;
	LeapYear = ((year % 400 == 0) || ((year % 4 == 0) // leap year algorithm
		&& (year % 100 != 0)));

	return LeapYear;
}

//calculates the century value
int getCenturyValue(int year)
{
	int remainder;
	int centuryValue;

	// pulls the year the user enters
	year /= 100;	
	remainder = year % 4;	
	centuryValue = (3 - remainder) * 2;		

	return centuryValue;
}

//calculates the year value
int getYearValue(int year)
{
	int remainder, yearValue;

	//pulls the year the user enters
	year %= 100;
	remainder = year / 4;
	yearValue = remainder + year;

	return yearValue;
}

//calculates the month value
int getMonthValue(int month, int year)
{
	int monthValue;

	//uses the month the user enters
	//uses the leap year function
	switch (month)
	{
	case 1: if (isLeapYear(year))
			monthValue = 6;
			else monthValue = 0;
			break;
	case 2: if (isLeapYear(year))
			monthValue = 2;
			else monthValue = 3;
			break;
	case 3: if (isLeapYear(year))
			monthValue = 3;
			else monthValue = 3;
			break;
	case 4: if (isLeapYear(year))
			monthValue = 6;
			else monthValue = 6;
			break;
	case 5:	if (isLeapYear(year))
			monthValue = 1;
			else monthValue = 1;
			break;
	case 6: if (isLeapYear(year))
				monthValue = 4;
			else monthValue = 4;
			break;
	case 7:	if (isLeapYear(year))
				monthValue = 6;
			else monthValue = 6;
			break;
	case 8:	if (isLeapYear(year))
				monthValue = 2;
			else monthValue = 2;
			break;
	case 9:	if (isLeapYear(year))
				monthValue = 5;
			else monthValue = 5;
			break;
	case 10: if (isLeapYear(year))
				monthValue = 0;
			else monthValue = 0;
			break;
	case 11: if (isLeapYear(year))
				monthValue = 3;
			else monthValue = 3;
			break;
	case 12: if (isLeapYear(year))
				monthValue = 5;
			else monthValue = 5;	
	}	
		
	return monthValue;
}
justStarting (30)
Never mind... I did some debugging and realized my data was not passing as it should through the if/else statements. I changed them to all switch instead and it works just fine. Glad I was able to solve before anyone posted (you never know how long it will take for a response... so I post a little early sometimes).
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