![]() ![]() MessageBox.Show("You didn't finish in time.", "Sorry!") a MessageBox, and fill in the answers. If the user ran out of time, stop the timer, show display the new time left by updating the If CheckTheAnswer() returns false, keep counting MessageBox.Show("You got all the answers right!", If CheckTheAnswer() returns true, then the user Private void timer1_Tick(object sender, EventArgs e) The code editor appears and displays the Tick handler's method.Īdd the following statements to the new event handler method. These actions add a Tick event handler to the timer. On the form, double-click the Timer control, or select it and then select Enter. It also checks how much time has elapsed in the quiz. This event handler checks the quiz taker's answers by calling CheckTheAnswer(). This code runs every second, after the timer raises a Tick event. Now that you have a way to check the answers, you can write the code for the Tick event handler. In the next section, you use the same property to display the correct answer in each control. The if statement uses the Value property of a NumericUpDown control to access the control's current value. Otherwise, the method returns a value of false. In this case, if the values are all correct, the method returns a value of true. You use the logical and operator to check whether more than one condition is true. In Visual Basic, the equivalent operator is AndAlso. You can't easily enter the multiplication sign (×) and the division sign (÷) by using the keyboard, so C# and Visual Basic accept an asterisk (*) for multiplication and a slash mark (/) for division. The Visual Basic version uses the Function keyword instead of the usual Sub keyword because this method returns a value. This method determines the answers to the math problems and compares the results to the values in the NumericUpDown controls. Multiplicand * multiplier = product.Value AndAlso Minuend - subtrahend = difference.Value AndAlso Public Function CheckTheAnswer() As Boolean ''' True if the answer's correct, false otherwise. ''' Check the answers to see if the user got everything right. ![]() & (multiplicand * multiplier = product.Value) & (minuend - subtrahend = difference.Value) / True if the answer's correct, false otherwise. / Check the answers to see if the user got everything right. Your code should look like the following sample. This method should be in line with the other methods, such as StartTheQuiz(). If time has run out, or if the answers are correct, the quiz should end.īefore you write that event handler, add a method called CheckTheAnswer() to determine whether the answers to the math problems are correct. It's also practical to check the answers in that event handler. Because this interval is in milliseconds, a value of 1000 causes the timer to raise a Tick event every second.īecause the timer raises a Tick event every second, it makes sense to check the elapsed time in a Tick event handler. On the form, select the timer1 icon that you just added, and set its Interval property to 1000. The control appears in the gray area at the bottom of the design window. In Windows Forms Designer, move a Timer control from the Components category of the Toolbox to your form. Use the programming language control at the top right of this page to view either the C# code snippet or the Visual Basic code snippet. ' This integer variable keeps track of the ' These integer variables store the numbers ' Create a Random object called randomizer This integer variable keeps track of the These integer variables store the numbers Create a Random object called randomizer ![]()
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