回答編集履歴
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追記
test
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@@ -33,3 +33,51 @@
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}
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```
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### 追記 System.Reactive を使う
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```C#
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using System;
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using System.Numerics;
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using System.Reactive;
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using System.Reactive.Linq;
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using System.Threading.Tasks;
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namespace ConsoleApp1
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{
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class Program
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{
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static async Task Main() => await Observable
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.Repeat(Unit.Default)
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.Select(_ => Console.ReadLine())
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.TakeWhile(a => !string.IsNullOrEmpty(a))
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.Select(a => BigInteger.Parse(a))
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.Retry()
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.ForEachAsync(a => Console.WriteLine((a + 1) * a / 2));
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}
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}
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```
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