Spital Matrix

#include "stdafx.h"
#include <iostream>

using namespace std;

void fillLeft();
void fillBottom();
void fillRight();
void fillTop();
void fillFrame();
void printMatrix();

const int x = 5;
const int y = 5;

int fillNumber = 1;
int goInside = 0;
int matrix[y][x] = { 0 };

void main()
{
    while (fillNumber <= x * y) { // 5 x 5 = 25
        fillFrame();
        goInside++;
    }

    printMatrix();
}

void fillLeft()
{
    for (int i = y - 2; i >= 0; i--) {
        if (matrix[i][0 + goInside] == 0) {
            matrix[i][0 + goInside] = fillNumber;
            fillNumber++;
        }
    }
}

void fillRight() {
    for (int i = 1; i < y; i++) {
        if (matrix[i][x - 1 - goInside] == 0) {
            matrix[i][x - 1 - goInside] = fillNumber;
            fillNumber++;
        }
    }
}

void  fillTop() {
    for (int i = 0; i < x; i++) {

        if (matrix[0 + goInside][i] == 0) {
            matrix[0 + goInside][i] = fillNumber;
            fillNumber++;
        }
    }
}

void fillBottom() {
    for (int i = x - 1; i >= 0; i--) {
        if (matrix[y - 1 - goInside][i] == 0) {
            matrix[y - 1 - goInside][i] = fillNumber;
            fillNumber++;
        }
    }
}

void fillFrame()
{
    fillTop();
    fillRight();
    fillBottom();
    fillLeft();
}

void printMatrix()
{
    for (int i = 0; i < y; i++)
    {
        for (int j = 0; j < x; j++)
        {
            cout << matrix[j][i] << "\t";
        }

        cout << endl;
    }
}