Needs to be solved with Visual C from the book Starting oout

Needs to be solved with \"Visual C#\" from the book \"Starting oout with visual C#, Tony Gaddis.

You will find a file named USPopulation.txt attached above. The file contains the midyear population of the United States, in thousands, during the years 1950 through 1990. The first line in the file contains the population for 1950, the second line contains the population for 1951, and so forth.

Create an application that reads the file\'s contents into an array or a List. The application should display the following data:

The average annual change in population during the time period

The year with the greatest increase in population during the time period

The year with the least increase in population during the time period

There are many ways to display the results. But I want to address a specific question about the last two bullet points: If the population in the file is the mid-year population, then is the year with the greatest increase (or lowest increase) the first or second year since the measurement happens in the middle of the year? Here are results from the Key so you can see one way to display the information:

Year Increase

1951 2114

1952 2411

1953 2563

1954 2928

1955 3185

Notice that the increase listed for 1951 is the increase from midyear 1950 to midyear 1951. Consequently, the largest increase will be the increase from 1954 to 1955 as this image shows:

USpopulation.txt file info below

151868
153982
156393
158956
161884
165069
168088
171187
174149
177135
179979
182992
185771
188483
191141
193526
195576
197457
199399
201385
203984
206827
209284
211357
213342
215465
217563
219760
222095
224567
227225
229466
231664
233792
235825
237924
240133
242289
244499
246819
249623

Can i also get the form design as well please.

Thank you!

Solution

frmPopulationData.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.IO;

namespace PopulationData
{
    public partial class frmPopulationData : Form
    {
        private static Dictionary<int, int> _PopulationData;
        public frmPopulationData()
        {
            InitializeComponent();
        }

        private void btnCalulate_Click(object sender, EventArgs e)
        {
            try
            {
                string[] data = File.ReadAllLines(\"USPopulation.txt\");
                if (data.Length > 0)
                {
                    _PopulationData = new Dictionary<int, int>();
                    ConvertDataToInt(data);
                    PrintAverageAnnualPopulationGrowth();
                    PrintGreatestPopulationIncreaseYear();
                    PrintLeastPopluationIncreaseYear();
                }
                else
                    MessageBox.Show(\"No data found in USPopulation.txt\");
            }
            catch (IOException)
            {
                MessageBox.Show(\"Error: USPopulation.txt not found. Place the file in the solution\'s bin/debug folder and try again.\");
            }
         }

        private void ConvertDataToInt(string[] populationData)
        {
           int year = 1950; //beginning year
            for (int entry = 0; entry < populationData.Length; entry++)
            {
                _PopulationData.Add(year, Convert.ToInt32(populationData[entry]));
                year++;
            }
        }

        private void PrintAverageAnnualPopulationGrowth()
        {
            double pastYear = 0;
            double totalChange = 0;
            double annualPercentageChange = 0;
            double totalPercentageChange = 0;
            double annualAveragePercent = 0;

            foreach (KeyValuePair<int, int> currentYear in _PopulationData)
            {
                if (currentYear.Key == 1950)
                    pastYear = currentYear.Value;
                else
                {
                    totalChange += currentYear.Value - pastYear;
                    annualPercentageChange = totalChange / pastYear;
                    totalPercentageChange += annualPercentageChange;
                    pastYear = currentYear.Value;
                }
            }
            if (totalPercentageChange > 0)
                annualAveragePercent = (totalPercentageChange / _PopulationData.Count) * 100;

            txtAverage.Text = annualAveragePercent.ToString(\"#0.##\") + \"%\";
        }

        private void PrintGreatestPopulationIncreaseYear()
        {
           int pastYearIncrease = 0;
           int currentYearIncrease = 0;
           int greatestYear = 0;
           int pastYear = 0;
         
           foreach (KeyValuePair<int, int> currentYear in _PopulationData)
           {
               if (currentYear.Key == 1950)
               {
                   pastYear = currentYear.Value;
                   greatestYear = currentYear.Key;
               }
               else
               {
                   currentYearIncrease = currentYear.Value - pastYear;
                   if (currentYearIncrease > pastYearIncrease)
                   {
                       pastYearIncrease = currentYearIncrease;
                       pastYear = currentYear.Value;
                       greatestYear = currentYear.Key;
                   }
               }
           }
            txGreatest.Text = greatestYear.ToString();
        }

    
        private void PrintLeastPopluationIncreaseYear()
        {
            int pastYearIncrease = 0;
            int currentYearIncrease = 0;
            int leastYear = 0;
            int pastYear = 0;

            foreach (KeyValuePair<int, int> currentYear in _PopulationData)
            {
                if (currentYear.Key == 1950)
                {
                    pastYear = currentYear.Value;
                    leastYear = currentYear.Key;
                }
                else
                {
                    currentYearIncrease = currentYear.Value - pastYear;
                    if (currentYearIncrease < pastYearIncrease)
                    {
                        pastYearIncrease = currentYearIncrease;
                        pastYear = currentYear.Value;
                        leastYear = currentYear.Key;
                    }
                }
            }
            txtLeast.Text = leastYear.ToString();
        }
    }
}

frmPopulationData.Designer.cs

namespace PopulationData
{
    partial class frmPopulationData
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name=\"disposing\">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.txtAverage = new System.Windows.Forms.TextBox();
            this.txGreatest = new System.Windows.Forms.TextBox();
            this.txtLeast = new System.Windows.Forms.TextBox();
            this.btnCalulate = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(31, 84);
            this.label1.Name = \"label1\";
            this.label1.Size = new System.Drawing.Size(187, 13);
            this.label1.TabIndex = 0;
            this.label1.Text = \"Average annual change in population:\";
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(31, 126);
            this.label2.Name = \"label2\";
            this.label2.Size = new System.Drawing.Size(219, 13);
            this.label2.TabIndex = 1;
            this.label2.Text = \"Year with the greatest increase in population:\";
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(31, 169);
            this.label3.Name = \"label3\";
            this.label3.Size = new System.Drawing.Size(203, 13);
            this.label3.TabIndex = 2;
            this.label3.Text = \"Year with the least increase in population:\";
            //
            // txtAverage
            //
            this.txtAverage.Location = new System.Drawing.Point(224, 81);
            this.txtAverage.Name = \"txtAverage\";
            this.txtAverage.Size = new System.Drawing.Size(100, 20);
            this.txtAverage.TabIndex = 3;
            //
            // txGreatest
            //
            this.txGreatest.Location = new System.Drawing.Point(256, 123);
            this.txGreatest.Name = \"txGreatest\";
            this.txGreatest.Size = new System.Drawing.Size(100, 20);
            this.txGreatest.TabIndex = 4;
            //
            // txtLeast
            //
            this.txtLeast.Location = new System.Drawing.Point(240, 166);
            this.txtLeast.Name = \"txtLeast\";
            this.txtLeast.Size = new System.Drawing.Size(100, 20);
            this.txtLeast.TabIndex = 5;
            //
            // btnCalulate
            //
            this.btnCalulate.Location = new System.Drawing.Point(34, 32);
            this.btnCalulate.Name = \"btnCalulate\";
            this.btnCalulate.Size = new System.Drawing.Size(75, 23);
            this.btnCalulate.TabIndex = 6;
            this.btnCalulate.Text = \"Calculate\";
            this.btnCalulate.UseVisualStyleBackColor = true;
            this.btnCalulate.Click += new System.EventHandler(this.btnCalulate_Click);
            //
            // frmPopulationData
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(416, 233);
            this.Controls.Add(this.btnCalulate);
            this.Controls.Add(this.txtLeast);
            this.Controls.Add(this.txGreatest);
            this.Controls.Add(this.txtAverage);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = \"frmPopulationData\";
            this.Text = \"Population Data\";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox txtAverage;
        private System.Windows.Forms.TextBox txGreatest;
        private System.Windows.Forms.TextBox txtLeast;
        private System.Windows.Forms.Button btnCalulate;
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PopulationData
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmPopulationData());
        }
    }
}