コンソール入力を読む

using System;

class Program
{
    static void Main()
    {
        // Console.ReadLine returns the typed line, or null when input ends.
        Console.Write("What is your name? ");
        string name = Console.ReadLine() ?? "friend";

        // int.TryParse converts text safely instead of throwing on bad input.
        Console.Write("How old are you? ");
        string text = Console.ReadLine() ?? "";
        if (int.TryParse(text, out int age))
        {
            Console.WriteLine($"Hello, {name}!");
            Console.WriteLine($"In 10 years you will be {age + 10}.");
        }
        else
        {
            Console.WriteLine($"\"{text}\" is not a whole number.");
        }
    }
}