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手順 7: 乗算問題と除算問題の追加

  • [アーティクル]

この手順を開始する前に、乗算問題と除算問題を追加する方法について考えてみてください。最初の手順は、値を格納することです。

乗算問題と除算問題を追加するには

  1. フォームに 4 つの int (Integer) を追加します。コードは次のようになります。

    Public Class Form1

    ' Create a Random object to generate random numbers.
    Private randomizer As New Random

    ' These Integers will store the numbers in the addition problem.
    Private addend1 As Integer
    Private addend2 As Integer

    ' These Integers will store the numbers for the subtraction problem.
    Private minuend As Integer
    Private subtrahend As Integer

    ' These Integers will store the numbers for the multiplication problem.
    Private multiplicand As Integer
    Private multiplier As Integer

    ' These Integers will store the numbers for the division problem.
    Private dividend As Integer
    Private divisor As Integer

    ' This Integer will keep track of the time left.
    Private timeLeft As Integer

    public partial class Form1 : Form
{
    // Create a Random object to generate random numbers.
    Random randomizer = new Random();

    // These ints will store the numbers for the addition problem.
    int addend1;
    int addend2;

    // These ints will store the numbers for the subtraction problem.
    int minuend;
    int subtrahend;

    // These ints will store the numbers for the multiplication problem.
    int multiplicand;
    int multiplier;

    // These ints will store the numbers for the division problem.
    int dividend;
    int divisor;

    // This int will keep track of the time left.
    int timeLeft;

  2. 前の手順のときと同様に、StartTheQuiz() メソッドを、ランダムな乗算問題と除算問題を表示するように変更します。コードは次のようになります。

    ''' <summary>
''' Start the quiz by filling in all of the problems
''' and starting the timer.
''' </summary>
''' <remarks></remarks>
Public Sub StartTheQuiz()

    ' Fill in the addition problem.
    addend1 = randomizer.Next(51)
    addend2 = randomizer.Next(51)
    plusLeftLabel.Text = addend1.ToString()
    plusRightLabel.Text = addend2.ToString()
    sum.Value = 0

    ' Fill in the subtraction problem.
    minuend = randomizer.Next(1, 101)
    subtrahend = randomizer.Next(1, minuend)
    minusLeftLabel.Text = minuend.ToString()
    minusRightLabel.Text = subtrahend.ToString()
    difference.Value = 0

    ' Fill in the multiplication problem.
    multiplicand = randomizer.Next(2, 11)
    multiplier = randomizer.Next(2, 11)
    timesLeftLabel.Text = multiplicand.ToString()
    timesRightLabel.Text = multiplier.ToString()
    product.Value = 0

    ' Fill in the division problem.
    divisor = randomizer.Next(2, 11)
    Dim temporaryQuotient As Integer = randomizer.Next(2, 11)
    dividend = divisor * temporaryQuotient
    dividedLeftLabel.Text = dividend.ToString()
    dividedRightLabel.Text = divisor.ToString()
    quotient.Value = 0

    ' Start the timer.
    timeLeft = 30
    timeLabel.Text = "30 seconds"
    Timer1.Start()

End Sub

    /// <summary>
/// Start the quiz by filling in all of the problems
/// and starting the timer.
/// </summary>
public void StartTheQuiz()
{
    // Fill in the addition problem.
    addend1 = randomizer.Next(51);
    addend2 = randomizer.Next(51);
    plusLeftLabel.Text = addend1.ToString();
    plusRightLabel.Text = addend2.ToString();
    sum.Value = 0;

    // Fill in the subtraction problem.
    minuend = randomizer.Next(1, 101);
    subtrahend = randomizer.Next(1, minuend);
    minusLeftLabel.Text = minuend.ToString();
    minusRightLabel.Text = subtrahend.ToString();
    difference.Value = 0;

    // Fill in the multiplication problem.
    multiplicand = randomizer.Next(2, 11);
    multiplier = randomizer.Next(2, 11);
    timesLeftLabel.Text = multiplicand.ToString();
    timesRightLabel.Text = multiplier.ToString();
    product.Value = 0;

    // Fill in the division problem.
    divisor = randomizer.Next(2, 11);
    int temporaryQuotient = randomizer.Next(2, 11);
    dividend = divisor * temporaryQuotient;
    dividedLeftLabel.Text = dividend.ToString();
    dividedRightLabel.Text = divisor.ToString();
    quotient.Value = 0;

    // Start the timer.
    timeLeft = 30;
    timeLabel.Text = "30 seconds"; 
    timer1.Start();
}

  3. CheckTheAnswer() メソッドを、乗算問題と除算問題についても確認するように変更します。コードは次のようになります。

    ''' <summary>
''' Check the answer to see if the user got everything right.
''' </summary>
''' <returns>True if the answer's correct, false otherwise.</returns>
''' <remarks></remarks>
Public Function CheckTheAnswer() As Boolean

    If addend1 + addend2 = sum.Value AndAlso 
       minuend - subtrahend = difference.Value AndAlso 
       multiplicand * multiplier = product.Value AndAlso 
       dividend / divisor = quotient.Value Then

        Return True
    Else
        Return False
    End If

End Function

    /// <summary>
/// Check the answer to see if the user got everything right.
/// </summary>
/// <returns>True if the answer's correct, false otherwise.</returns>
private bool CheckTheAnswer()
{
    if ((addend1 + addend2 == sum.Value)
        && (minuend - subtrahend == difference.Value)
        && (multiplicand * multiplier == product.Value)
        && (dividend / divisor == quotient.Value))
        return true;
    else
        return false;
}

    [!メモ]

    乗算記号 (×) と除算記号 (÷) はキーボードから簡単に入力できないため、Visual C# および Visual Basic では、乗算にはアスタリスク (*)、除算にはスラッシュ記号 (/) を使用します。

  4. タイマーの Tick イベント ハンドラーの最後の部分を、残り時間がなくなったら正しい答えを表示するように変更します。コードは次のようになります。

    Else
    ' If the user ran out of time, stop the timer, show
    ' a MessageBox, and fill in the answers.
    Timer1.Stop()
    timeLabel.Text = "Time's up!"
    MessageBox.Show("You didn't finish in time.", "Sorry")
    sum.Value = addend1 + addend2
    difference.Value = minuend - subtrahend
    product.Value = multiplicand * multiplier
    quotient.Value = dividend / divisor
    startButton.Enabled = True
End If

    else
{
    // If the user ran out of time, stop the timer, show
    // a MessageBox, and fill in the answers.
    timer1.Stop();
    timeLabel.Text = "Time's up!";
    MessageBox.Show("You didn't finish in time.", "Sorry");
    sum.Value = addend1 + addend2;
    difference.Value = minuend - subtrahend;
    product.Value = multiplicand * multiplier;
    quotient.Value = dividend / divisor;
    startButton.Enabled = true;
}

  5. プログラムを保存し、実行します。これで、次の図に示すように、クイズを完了するために答える必要がある 4 つの問題が揃いました。

    4 つの問題が表示された計算クイズ

    4 つの問題がある計算クイズ

続行または確認するには