C#

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

        }
    }
}  

 private static DataGridView Firstdgv;    
        private static DataGridView Finaldgv = new DataGridView();     
        private static List<string> SelectedColumns = new List<string>();  
        private static List<string> AvailableColumns = new List<string>();  
 
 
   public  void Print_DataGridView(DataGridView dgv1)
        {
            PrintPreviewDialog ppvw;
            try
            {
                // Getting DataGridView object to print
                Firstdgv = dgv1;
                 
 
                // Getting all Coulmns Names in the DataGridView
                AvailableColumns.Clear();
                foreach (DataGridViewColumn c in Firstdgv.Columns)
                {
                    if (!c.Visible) continue;
                    AvailableColumns.Add(c.HeaderText);
                }
 
                // Showing the PrintOption Form
                FrmPrintOptions dlg = new FrmPrintOptions(AvailableColumns);
                if (dlg.ShowDialog() != DialogResult.OK) return;
 
                PrintTitle = dlg.PrintTitle;
                PrintAllRows = dlg.PrintAllRows;
                FitToPageWidth = dlg.FitToPageWidth;
                SelectedColumns = dlg.GetSelectedColumns();
 
               // RowsPerPage = 0;
 
                ppvw = new PrintPreviewDialog();
 
                //ppvw.Document = printDoc;
                Finaldgv.AutoGenerateColumns = false;
                foreach (DataGridViewColumn GridCol in Firstdgv.Columns)
                {
                    if (!GridCol.Visible) continue;
                    if (!SelectedColumns.Contains(GridCol.HeaderText)) continue;
                   Finaldgv.Columns.Add((DataGridViewColumn)GridCol.Clone()); ****
                     
                 }   
 
                DGVPrinter obj = new DGVPrinter();
                obj.PrintPreviewDataGridView(Finaldgv);
 
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
}