C#

<pre lang="css">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace ConsoleApplication1
{
    public class Building
    {

           // csv File contains :


            //Id    X   Y
            //0 91  57
            //1 67  24
            //2 27  27
            //3 97  56
            //4 25  19
            //5 95  18
            //6 5   69
            //7 46  94
            //8 29  68
            //9 92  28


            int[] list1  = new int[3] { 0, 91, 57 };
            int[] list2  = new int[3] { 1, 67, 24 };
            int[] list3  = new int[3] { 2, 27, 27 };
            int[] list4  = new int[3] { 3, 97, 56 };
            int[] list5  = new int[3] { 4, 25, 19 };
            int[] list6  = new int[3] { 5, 95, 18 };
            int[] list7  = new int[3] { 6, 5, 69 };
            int[] list8  = new int[3] { 7, 46, 94 };
            int[] list9  = new int[3] { 8, 29, 68 };
            int[] list10 = new int[3] { 9, 92, 28 };

            //int[][][] lists = new int[][][] { list1, list2, list3, list4, list5, list6, list7, list8, list9, list10 };



           for (int i = 0; i < 4; i++)
            {

                int numberIn = list1[i];
                System.Console.WriteLine(numberIn);

            }


    }
}

if (x2 > x1, x2 - x1, x1 - x2)
        (then)   (else)

if (x2 > x1, x2 - x1, x1 - x2)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Stem
    {
        static void Main(string[] args)
        {
            // retrieve file name from Main

            // activate 'Building' class (to generate array of coordinates)

            // retrieve array  containing coordinates
            
            //Like:
            //Id	X	Y
            //0	19	75
            //1	76	42
            //2	72	72



            // run through all IDed x,y coordinate combinations and fire off class that performs calculation, one coordinate combination at a time.  Results retrieved and held in array.

            // calls print class at end where output file is produced

        }
    }
}