7단계: 곱하기 및 나누기 문제 추가
이 자습서의 7단계에서는 곱하기와 나누기 문제를 추가합니다. 하지만 먼저 이렇게 변경하는 방법을 살펴보겠습니다.값을 저장하는 첫 단계를 알아야 합니다.
곱하기 및 나누기 문제를 추가하려면
정수 변수를 네 개 더 폼에 추가합니다.
Public Class Form1 ' Create a Random object called randomizer ' to generate random numbers. Private randomizer As New Random ' These integer variables store the numbers ' for the addition problem. Private addend1 As Integer Private addend2 As Integer ' These integer variables store the numbers ' for the subtraction problem. Private minuend As Integer Private subtrahend As Integer ' These integer variables store the numbers ' for the multiplication problem. Private multiplicand As Integer Private multiplier As Integer ' These integer variables store the numbers ' for the division problem. Private dividend As Integer Private divisor As Integer ' This integer variable keeps track of the ' remaining time. Private timeLeft As Integer
public partial class Form1 : Form { // Create a Random object called randomizer // to generate random numbers. Random randomizer = new Random(); // These integer variables store the numbers // for the addition problem. int addend1; int addend2; // These integer variables store the numbers // for the subtraction problem. int minuend; int subtrahend; // These integer variables store the numbers // for the multiplication problem. int multiplicand; int multiplier; // These integer variables store the numbers // for the division problem. int dividend; int divisor; // This integer variable keeps track of the // remaining time. int timeLeft;
이전과 마찬가지로 StartTheQuiz() 메서드를 수정하여 곱하기 및 나누기 문제를 난수로 채웁니다.
''' <summary> ''' Start the quiz by filling in all of the problem ''' values and starting the timer. ''' </summary> ''' <remarks></remarks> Public Sub StartTheQuiz() ' Fill in the addition problem. ' Generate two random numbers to add. ' Store the values in the variables 'addend1' and 'addend2'. addend1 = randomizer.Next(51) addend2 = randomizer.Next(51) ' Convert the two randomly generated numbers ' into strings so that they can be displayed ' in the label controls. plusLeftLabel.Text = addend1.ToString() plusRightLabel.Text = addend2.ToString() ' 'sum' is the name of the NumericUpDown control. ' This step makes sure its value is zero before ' adding any values to it. 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 problem /// values and starting the timer. /// </summary> public void StartTheQuiz() { // Fill in the addition problem. // Generate two random numbers to add. // Store the values in the variables 'addend1' and 'addend2'. addend1 = randomizer.Next(51); addend2 = randomizer.Next(51); // Convert the two randomly generated numbers // into strings so that they can be displayed // in the label controls. plusLeftLabel.Text = addend1.ToString(); plusRightLabel.Text = addend2.ToString(); // 'sum' is the name of the NumericUpDown control. // This step makes sure its value is zero before // adding any values to it. 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(); }
곱하기 및 나누기 문제에 대해서도 확인하도록 CheckTheAnswer() 메서드를 수정합니다.
''' <summary> ''' Check the answers 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 answers 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; }
키보드를 사용하여 곱하기 기호(×)와 나누기 기호(÷)를 입력하기가 쉽지 않으므로 Visual C# 및 Visual Basic에서는 별표(*)를 곱하기에, 슬래시(/)를 나누기에 각각 사용합니다.
시간이 다 되면 자동으로 올바른 답을 채우도록 타이머의 Tick 이벤트 처리기 마지막 부분을 변경합니다.
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; }
프로그램을 저장하고 실행합니다.
다음 그림과 같이 퀴즈를 푸는 사람은 네 가지 문제에 대한 답을 입력하여 퀴즈를 완료해야 합니다.
네 개의 문제가 있는 수학 퀴즈
계속하거나 검토하려면
다음 자습서 단계로 이동하려면 8단계: 퀴즈 사용자 지정를 참조하십시오.
이전 자습서 단계로 돌아가려면 6단계: 빼기 문제 추가를 참조하십시오.