asd

20240408/WindowsFormsApp2/Form1.cs

@@ -0,0 +1,90 @@
+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 WindowsFormsApp2
+{
+    
+    public partial class Form1 : Form
+    {
+        int n;
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            n = 0;
+            string filename = "szamok.txt";
+            if (File.Exists(filename))
+            {
+                StreamReader streamReader = File.OpenText(filename);
+                while (!streamReader.EndOfStream && n < 100)
+                {
+                    int val = Convert.ToInt32(streamReader.ReadLine());
+                    if (val % 2 == 0)
+                    {
+                        listBox1.Items.Add(val);
+                    }
+                    else
+                    {
+                        listBox2.Items.Add(val);
+                    }
+                    Data.szamok[n] = val;
+                    n++;
+                }
+                streamReader.Close();
+            }
+            else
+            {
+                MessageBox.Show("HIBA!!");
+            }
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            string filename = "paros.txt";
+            StreamWriter sw = File.CreateText(filename);
+            for (int i = 0; i < n; i++)
+            {
+                if (Data.szamok[i] % 2 == 0)
+                {
+                    sw.WriteLine(Data.szamok[i]);
+                }
+            }
+            sw.Close();
+        }
+    }
+
+    public static class Data
+    {
+        public const int MAX = 100;
+        public static int[] szamok = new int[MAX];
+    }
+}
+
+
+
+
+/*
+ * 
+ * creation of 100 random numbers
+            FileStream fs = new FileStream("szamok.txt", FileMode.Create, FileAccess.ReadWrite);
+            StreamWriter streamWriter = new StreamWriter(fs);
+            Random random = new Random();
+            for (int i = 0; i < 100; i++)
+            {
+                streamWriter.WriteLine(random.Next(1, 10));
+            }
+
+            streamWriter.Close();
+            fs.Close();
+*/