Syntax help

I am stuck at the very last part. I really cant figure the syntax on how to add the numbers.

Code:

#include <iostream>
using namespace std;
#include <cstdlib>
#include <string>
void getHours (int);
void getMinutes (int);
void calcTotalTime (int);

bool isValidMinutes (Minutes Test);

bool isValidHours(Hours Test);

const int MAX_MINS = 59;
const int MAX_HOURS = 23;
const int MIN_MINS = 0;
const int MIN_HOURS = 0;


int main ()

{

    int hours, minutes;
	int addedHours, addedMinutes;

    cout << "Enter the number of hours for the starting time: ";
	cin >> hours;
    cout << "Enter the number of minutes for the starting time: ";
	cin >> minutes;
    cout << "Enter the number of hours to be added to the starting time: ";
	cin >> addedHours;
    cout << "Enter the number of minutes to be added to the starting time: ";
	cin >> addedMinutes;
	getHours(hours);
	getMinutes(minutes);
    calcTotalTime (int);

    cout << "\nThe total time is " << hours << " hours and "

            << minutes << " minutes." << endl;

    return 0;

}

bool isValidMinutes (Minutes Test)
{
	if ( Minutes < 0 || Minutes > 60)
		cout << "Invalid number: \n" ;
	else
		return true
}

bool isValidHours(Hours Test)
{
	if ( Hours < 0 || or Hours > 23)
		cout << "Invalid number: \n" ;
	else
		return true
}


void getHours (int i)
{
	cout << " Total number of hours: " << i <<endl;
}

void getMinutes (int x)
{
	cout << " Total number of minutes: " << x << endl;
}

void calcTotalTime (int )
{

You have to state what your goal is, i.e. what you want to happen with some given input.