計算機科学のブログ

Q q = new Q(Q.R.Next(2) == 1);


while (true)
{
    Console.Write($"{q.N1} {q.Op} {q.N2} = ");
    if (!int.TryParse(Console.ReadLine(), out int i))
    {
        Console.WriteLine("Thanks for playing!");
        break;
    }
    if (q.Check(i))
    {
        Console.WriteLine($"Right!");
        q = new Q(Q.R.Next(2) == 1);
    }
    else
    {
        Console.WriteLine("Wrong! Try again.");
    }
}

internal class Q
{
    public Q(bool add)
    {
        if (add)
        {
            Op = "+";
        }
        else
        {
            Op = "*";
        }
        N1 = R.Next(1, 10);
        N2 = R.Next(1, 10);
    }
    public static Random R = new Random();
    public int N1 { get; private set; }
    public string Op { get; private set; }
    public int N2 { get; private set; }
    public bool Check(int a)
    {
        if (Op == "+")
        {
            return a == N1 + N2;
        }
        return a == N1 * N2;
    }

}

% dotnet run 
3 + 3 = 6
Right!
7 * 4 = 28
Right!
7 * 1 = 7
Right!
1 + 4 = 5
Right!
4 * 1 = 4
Right!
1 * 8 = 0
Wrong! Try again.
1 * 8 = a
Thanks for playing!
%