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- using System;
- class Program
- {
- static void Main()
- {
- const string CommandSum = "sum";
- const string CommandExit = "exit";
- List<int> numbers = new List<int>();
- string userInput;
- bool isContinue = true;
- while (isContinue)
- {
- Console.Clear();
- Console.WriteLine($"{CommandSum} - сумма чисел.");
- Console.WriteLine($"{CommandExit} - выход.");
- Console.Write("Или введите число: ");
- userInput = Console.ReadLine();
- switch (userInput)
- {
- case CommandSum:
- ShowSum(numbers);
- break;
- case CommandExit:
- isContinue = false;
- break;
- default:
- TryAddNumber(numbers, userInput);
- break;
- }
- }
- }
- static void TryAddNumber(List<int> numbers, string userInput)
- {
- if (Int32.TryParse(userInput, out int number))
- {
- numbers.Add(number);
- Console.WriteLine("Число добавлено.");
- ShowNumbers(numbers);
- }
- else
- {
- Console.WriteLine("Не удалось добавить новое число.");
- }
- Console.ReadKey();
- }
- static void ShowSum(List<int> numbers)
- {
- Console.Clear();
- ShowNumbers(numbers);
- int sum = 0;
- foreach (int number in numbers)
- sum += number;
- Console.WriteLine($"\nСумма всех чисел: {sum}");
- Console.ReadKey();
- }
- static void ShowNumbers(List<int> numbers)
- {
- foreach (var number in numbers)
- {
- Console.Write($"{number} ");
- }
- Console.WriteLine();
- }
- }
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