Paso 7: Agregar problemas de multiplicación y división

Artículo
05/15/2010

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

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.
    Dim randomizer As New Random

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

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

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

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

    ' This Integer will keep track of the time left.
    Dim 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;

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();
}

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.

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;
}

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

Para continuar o revisar

Para ir al siguiente paso del tutorial, vea Paso 8: Probar otras características.
Para volver al paso anterior del tutorial, vea Paso 6: Agregar un problema de resta.

Paso 7: Agregar problemas de multiplicación y división

Para agregar problemas de multiplicación y división

Para continuar o revisar

Recursos adicionales