my output keeps putting out monday for everything need help with this, kinda confused on what im dooing

#include <iostream>
#include <iomanip>
using namespace std; 
void displayTitle();
int getMonth(int month);
int getDay(int day);
int getYear(int year);
int CalcDayofWeek(int month, int day, int year);
void displayDay(int G);
int main()
{
	//declare variables
	int month, 
	        day, 
	       year;
	int M, //month number
		K, //day of the month
		C, //century year
		D, //year number
		G;
		
	//input
	
	displayTitle();
	getMonth(month);
	getDay(day);
	getYear(year);

	//process
	CalcDayofWeek(month, day, year);
	//output
	displayDay(G);

	system("pause");
	return 0;
}
void displayTitle()
	{
	cout<< setw(30) << "Zeller's Algorithm\n";
	cout<<endl;
	}
int getMonth(int month)
	{
	cout<< setw(20) << "Enter the month <or 0 to exit>";
	cin>>month;
	cout<<endl;
	return month;
	}
int getDay(int day)
	{
	cout<< setw(20) << "Enter the day                 ";
	cin>>day;
	cout<<endl;
	return day;
	}
int getYear(int year)
	{
	cout<< setw(20) << "Enter the year                ";
	cin>>year;
	cout<<endl;
	return year;
	}
int CalcDayofWeek(int month, int day, int year)
    {
    int M = month;
	int K = day;
    int C = year / 100;
    int D = year % 100;
	int G;
	G = static_cast<double> )2.6 * M - 0.2) + K + D + (D/4) + (C/4) - 2 * C;
		if (G < 0)
			G = G + 7;
		return G;
    }
	void displayDay(int G)
	{
    switch (G)
    {
    case 0: cout << "Sunday" << endl; break;
    case 1: cout << "Monday" << endl; break;
    case 2: cout << "Tuesday" << endl; break;
    case 3: cout << "Wednesday" << endl; break;
    case 4: cout << "Thursday" << endl; break;
    case 5: cout << "Friday" << endl; break;
    case 6: cout << "Saturday" << endl; break;
    }
	}

>>(D/4) + (C/4)
This is doing integer arithmetic, meaning all decimals are discarded leaving only the integer portion. try casing to double to see if it fixed your problem -- I don't know whether it will or not ( (double)D / 4.0) + ( (double)C / 4.0)

You have functions that return values, yet you don't capture or use those in main( ). You are probably always computing the day that the random value in memory that G points to equates to.

Garbage In, Garbage Out

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