Need help calling functions

[rororoxor]

int determineDay(int month, int day, int year) {
	char slash_dummy;
	cout << "Enter your date of birth" << endl;
	cout << "format : month / day / year--> ";
	cin >> month >> slash_dummy >> day >> slash_dummy >> year;
	int monthEq;
	if (month == 1 || month == 2) {
		monthEq = month + 12;
	}
	else {
		monthEq = month;
	}
	int dayEq = day;
	int yearPrefix = year / 100;
	int yearEq = year % (yearPrefix * 100);
	int dayOfWeek = (day + ((13 * (monthEq + 1)) / 5) + yearEq + (yearEq / 4) + (yearPrefix / 4) + 5 * yearPrefix) % 7;
    return 0;
}


void printDayOfBirth(int day) {
   if (dayOfWeek == 0) {
   cout << "Saturday";
   }
   else if (dayOfWeek == 1) {
   cout << "Sunday";
   }
   else if (dayOfWeek == 2) {
   cout << "Monday";
   }
   else if (dayOfWeek == 3) {
   cout << "Tuesday";
   }
   else if (dayOfWeek == 4) {
   cout << "Wednesday";
   }
   else if (dayOfWeek == 5) {
   cout << "Thurday";
   }
   else {
   cout << "Friday";
   }
   return;
}

I want to call dayOfWeek into printDayOfBirth so that printDayOfBirth already knows its value. How do I do that? Nothing I try seems to work.

[poteto]

What the hell are you doing with the returns, who taught you to use them like that?

[bradltr95]

Excuse my friend here hes new to human interaction.

Return statements are used in functions to return some value depending on what you expect the function to do. A void function is not expected to return any values so it can be used to cout the day of birth depending on the parameters given. When you make a function an int, char, double, ect.. you must return that data type from that function. The function determineDay(); should be returning a value based on what you're doing inside of the function.

Take a look at this stuff and make sure you understand how functions work :)
http://www.cplusplus.com/doc/tutorial/functions/

Once you understand functions you can take a look into templates for more control
http://www.cplusplus.com/doc/tutorial/functions2/