array issue

Not sure what I am doing wrong but have an issue with a program...i am to input a file name that i have in my project and it is not doing it right...

This is what my program should look like for each textfile...

Sample Output 1
Enter the file to read in: data1.txt
The numbers in the array are:

45.3 57.4 23.6 34.2
234.6 34.9 54.8 934.9
8432.5 9809.3 539.7 43.9
12.0


The numbers in the array are:

12.0 23.6 34.2 34.9
43.9 45.3 54.8 57.4
234.6 539.7 934.9 8432.5
9809.3


The average of the numbers is 1558.2
The median of the numbers is 54.8

Press any key to continue


What I am getting is...

Enter the file to read in: data1.txt

The numbers in the array are:

The average of the numbers is 45
The median of the numbers is 0

Press any key to continue...

Not sure what I am doing wrong any help would mean alot

Code:

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;

const int MAX_SIZE = 100;

void Fill_Array(int Size[], int& count, int& numbers_used);
void Print_Array(int Size[], int count);
double Calc_Average(int Size[], double average);
void Sort(int Size[], int numbers_used);
void Swap(int& v1, int& v2);
int index_of_smallest(const int Size[], int start_index, int number_used);
int Calc_Median(int median, int Size[]);
void Print_Array_and_Calculations(int median, double average);

int main()
{
	ifstream in_size;
	int count;
	int Size [MAX_SIZE],
	    numbers_used = 0,
	    median = 0;
	double average = 0.0;

	Fill_Array(Size, count, numbers_used);
	Print_Array(Size, count);
	average = Calc_Average(Size, average);
	Sort(Size, numbers_used);
	Calc_Median(median, Size);
	Print_Array_and_Calculations(median, average);
	
	in_size.close();
	return 0;
}

void Fill_Array(int Size[], int& count, int& numbers_used)
{
	int size;
	ifstream in_size;
	string text_file;
	
	
	cout << "Enter the file to read in: ";
	getline(cin, text_file);
	
	cout << endl << "The numbers in the array are:" << endl << endl;
	in_size.open (text_file.c_str ());
	if(in_size.fail())
	{
		cerr  << "Error opening file" << endl;
		exit(1);
	}
	count = 0;
	in_size >> size;
	while((!in_size.eof()) && (count <= MAX_SIZE))
	{
		Size[count] = size;
		count++;
		in_size >> size;
	}
	in_size.close();
}

void Print_Array(int Size[], int count)
{
	int number_used = 0;
	for(int index = 0; index < number_used; index++)
		cout << Size[index] << " ";
}

double Calc_Average(int Size[], double average)
{
	int total = 0;
	for (int i = 0; i < MAX_SIZE; i++)
	{
		total = total + Size[i];
	}
	average = double(total) / MAX_SIZE;

	return average;
}

void Sort(int Size[], int number_used)
{
	int index_of_next_smallest;
	
	for (int index = 0; index < number_used - 1; index++)
	{
		index_of_next_smallest = index_of_smallest(Size, index, number_used);
		Swap(Size[index], Size[index_of_next_smallest]);
	}
}

void Swap(int& v1, int& v2)
{
	int temp;
	temp = v1;
	v1 = v2;
	v2 = temp;
}

int index_of_smallest(const int Size[], int start_index, int number_used)
{
	int min = Size[start_index],
		index_of_min = start_index;
	for (int index = start_index + 1; index < number_used; index++)
		if(Size[index] < min)
		{
			min = Size[index];
			index_of_min = index;
		}
		return index_of_min;
}

int Calc_Median(int median, int Size[])
{
	median = Size [ MAX_SIZE / 2 ];
	return median;
}

void Print_Array_and_Calculations(int median, double average)
{
	cout << endl << "The average of the numbers is " << average;
	cout << endl << "The median of the numbers is " << median;
	cout << endl << endl;
}