finally

ClassMultiplyWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace Lab
+{
+    /// <summary>
+    /// Interaction logic for ClassMultiplyWindow.xaml
+    /// </summary>
+    public partial class ClassMultiplyWindow : Window
+    {
+        private void ClickBack(object sender, RoutedEventArgs e) => Close();
+
+        private void ClickMul(object sender, RoutedEventArgs e)
+        {
+            ClassOutText.Text = "";
+
+            if (!Parsers.TryParseDouble(FirstBox.Text, out var first))
+            {
+                ClassOutText.Text = "first должен быть числом.";
+                return;
+            }
+
+            if (!Parsers.TryParseDouble(SecondBox.Text, out var second))
+            {
+                ClassOutText.Text = "second должен быть числом.";
+                return;
+            }
+
+            if (second < 0 || second >= 1)
+            {
+                ClassOutText.Text = "second должен быть в диапазоне [0; 1).";
+                return;
+            }
+
+            if (!Parsers.TryParseDouble(KBox.Text, out var k))
+            {
+                ClassOutText.Text = "k должен быть числом.";
+                return;
+            }
+
+            var num = new SplitNumber();
+            num.Value = first + second;
+
+            double val = num.Value;
+            first = num.first;
+            second = num.second;
+            
+            num.Multiply(k);
+
+            ClassOutText.Text =
+                $"Исходное число: {val} (first={first}, second={second})\n" +
+                $"Множитель k = {k}\n" +
+                $"Результат: {num.Value} (first={num.first}, second={num.second})";
+        }
+
+        public ClassMultiplyWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}