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Paso 7: Agregar problemas de multiplicación y división

  • Artículo

Antes de comenzar este procedimiento, piense en cómo agregará los problemas de multiplicación y división.Piense en el paso inicial, que requiere almacenar valores.

Para agregar problemas de multiplicación y división

  1. Agregue cuatro valores de tipo int (Integer) al formulario.El código debe tener este aspecto.

    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. Al igual que antes, modifique el método StartTheQuiz() para rellenar problemas de multiplicaciones y divisiones aleatorias.El código debe tener este aspecto.

    ''' <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. Modifique el método CheckTheAnswer() para que también compruebe los problemas de división y multiplicación.El código debe tener este aspecto.

    ''' <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;
}

    [!NOTA]

    Dado que no hay ninguna manera simple de escribir el signo de multiplicación (×) y el signo de división (÷) mediante el teclado, Visual C# y Visual Basic utilizan el asterisco (*) para la multiplicación y la barra diagonal (/) para la división.

  4. Cambie la última parte del controlador de evento Tick del temporizador de modo que rellene la respuesta correcta cuando se agote el tiempo.El código debe tener este aspecto.

    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. Guarde y ejecute el programa.Ahora, hay que responder a cuatro problemas para completar la prueba, como se muestra en la siguiente imagen.

    Prueba matemática con cuatro problemas

    Prueba matemática con cuatro problemas

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