C#

public static IEnumerable<Rectangle> GetNearbyPoints(int maxDist, List<Point> points, int nRows, int nColumns)
{
    int x, y, w, h;
    int half = maxDist / 2;

    List<Rectangle> rects = new List<Rectangle>();
        
    for (int i = 0; i < points.Count(); i++)
    {
        Point pt = points[i];
        x = pt.X;
        y = pt.Y;

        if (x < 0) x = 0;
        w = maxDist;
        if (x + half > nColumns)
        {
            w  = nColumns - x;
        }

        if (y < 0) y = 0;

        h = maxDist;
        if (y + half > nRows)
        {
            h = nRows - y;
        }

        yield return (new Rectangle(x,y,w,h));
    }
}

public static IEnumerable<Point> RectanglesToPoints(IEnumerable<Rectangle> rects)
{
    return rects.Select(r => RectToPoints(r)).SelectMany(pt => pt);
}

public static IEnumerable<Point> RectToPoints(Rectangle rect)
{
    for (int i = rect.X; i < rect.Width + rect.X; i++)
    {
        for (int j = rect.Y; j < rect.Height + rect.Y; j++)
        {
            yield return new Point(i,j);
        }
    }
}

BillWoodruff wrote:

It was fun to think about this.

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("I win!");
        Console.ReadLine();
    }
}

private double Average(double[] iArray)
    {
    double total = 0.0;
    double average;

    for (double index = 0; index < iArray.Length; index++)
        {
        total += iArray[index];
        }

    average = (double)total / iArray.Length;
    return average;
    }

Cannot implicitly convert type 'double' to 'int'. An explicit conversion exists (are you missing a cast?)

total += iArray[(int)index];

private double Average(double[] iArray)
    {
    double total = 0.0;
    double average;

    for (int index = 0; index < iArray.Length; index++)
        {
        total += iArray[index];
        }

    average = total / iArray.Length;
    return average;
    }

while (!inputFile.EndOfStream && index < sales.Length)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace Total_Sales_Homework
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private double Average(int[] iArray)
        {
            double total = 0.0;
            double average;

            for (int index = 0; index < iArray.Length; index++)
            {
                total += iArray[index];
            }

            average = (double)total / iArray.Length;
            return average;
        }

        private double Highest(int[] iArray)
        {
            double highest = iArray[0];

            for (int index = 1; index < iArray.Length; index++)
            {
                if (iArray[index] > highest)
                {
                    highest = iArray[index];
                }
            }

            return highest;
        }

        private double Lowest(int[] iArray)
        {
            double lowest = iArray[0];

            for (int index = 1; index < iArray.Length; index++)
            {
                if (iArray[index] < lowest)
                {
                    lowest = iArray[index];
                }
            }

            return lowest;
        }

        private double Total(double[] iArray)
        {
            double total = iArray[0];
            return total;
        }

        private void salesButton_Click(object sender, EventArgs e)
        {
            try
            {
                double totalSales;
                double highestSales;
                double lowestSales;
                double averageSales;
                StreamReader inputFile;
                const int SIZE = 6;
                int[] sales = new int[SIZE];
                int index = 0;

                inputFile = File.OpenText("Sales.txt");

                while (!inputFile.EndOfStream && index < sales.Length)
                {
                    sales[index] = int.Parse(inputFile.ReadLine());
                    index++;
                }

                inputFile.Close();

                foreach (int value in sales)
                {
                    salesListBox.Items.Add(value);
                }

                totalSales = Highest(sales);
                highestSales = Highest(sales);
                lowestSales = Lowest(sales);
                averageSales = Average(sales);

                totalSalesLabel.Text = totalSales.ToString("n1");
                averageSalesLabel.Text = averageSales.ToString("n1");
                highestSalesLabel.Text = highestSales.ToString("n1");
                smallestSalesLabel.Text = lowestSales.ToString("n1");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

private int Double(int value)
   {
   return value * value;
   }