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Fig. 4.19
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Let us now assign the following initial values to the control properties listed below: Object Form1 Label1 Label2 Property Caption Caption Font Caption Value Temperature Conversion Temperature Conversion MS Sans Serif, 12-point Enter original temperature in degrees Fahrenheit
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Object Label3 Option1 Option2 Text1 Text2 Command1 Command2
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Property Caption Caption Value Caption Text Text Caption Caption
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Value Equivalent temperature in degrees Celsius Fahrenheit to Celsius True Celsius to Fahrenheit (blank) (blank) Go End
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After assigning these values to their respective control properties and resizing the controls, the Form Design Window appears as shown in Fig. 4.20.
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Fig. 4.20
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Next, we must add the required instructions. In this example we will provide an event procedure for each option button (to provide the proper prompts), and an event procedure for each command button (to carry out the proper conversion). The event procedures are listed below.
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Private Sub Option1_Click() If (Option1.Value = True) Then Label2.Caption = "Enter original temperature in degrees Fahrenheit" Text1.Text = "" Label3.Caption = "Equivalent temperature in degrees Celsius" Text2.Text = "" End If End Sub
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Private Sub Option2_Click() If (Option2.Value = True) Then Label2.Caption = "Enter original temperature in degrees Celsius" Text1.Text = "" Label3.Caption = "Equivalent temperature in degrees Fahrenheit" Text2.Text = "" End If End Sub Private Sub Command1_Click() Dim TempIn As Double, TempOut As Double TempIn = Val(Text1.Text) If (Option1 = True) Then TempOut = (5 / 9) * (TempIn - 32) Else TempOut = 1.8 * TempIn + 32 End If Text2.Text = Str(TempOut) End Sub Private Sub Command2_Click() End End Sub
Fig. 4.21 shows the appearance of the form when the program is first executed, before the first actual calculation. In this figure the user has entered a given value of 68 degrees Fahrenheit, but has not yet clicked on the Go button.
Fig. 4.21
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In Fig. 4.22 we see the resulting output, after clicking on the Go button. Thus, a temperature of 68 degrees Fahrenheit is equivalent to 20 degrees Celsius. Fig. 4.23 shows the result of an opposite calculation, in which a temperature of 40 degrees Celsius is determined to be equivalent to 104 degrees Fahrenheit.
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Fig. 4.22 Fig. 4.23
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Many applications require several different groups of option buttons, where the selection of an option button within each group is independent of the selections made in other groups. This can be accomplished by placing each option-button group within a separate frame. (Existing option buttons can be moved into a frame using cut-and-paste techniques.) The use of option-button groups within frames is illustrated in the next example.
EXAMPLE 4.8 SELECTING MULTIPLE ALTERNATIVES (TEMP. CONVERSION REVISITED)
Let us now extend the temperature conversion program presented in Example 4.7 to include the following additional features: 1. 2. 3. Display the equivalent temperature in either full precision (maximum number of decimal places) or rounded to the nearest integer. Display the equivalent temperature in either a large (12-point) font or a small (8-point) font. Display the absolute temperature, in addition to the converted temperature (i.e., display the temperature in degrees Kelvin in addition to degrees Celsius, or in degrees Rankin in addition to degrees Fahrenheit). Note that K = C + 273.15, and R = F + 459.67.
To implement these features, we will place the original two option buttons (indicating the type of conversion) within a frame. We will also place two more option buttons (to select the precision) within a second frame, and an additional two option buttons (to select the font size) within a third frame. In addition, we will use a check box to display the absolute temperature as an option. We will also add a new label and a new text box, to label and display the absolute temperature. Fig. 4.24 shows the preliminary Form Design Window layout.
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