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Fig. 4.24
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We now assign the following initial values to the control properties listed below. (Note that some of these assignments are repeated from the previous example. The new assignments are italicized.)
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Object Form1 Label1 Label2 Label3 Label4 Option1 Option2 Option3 Option4 Option5 Option6 Frame1 Frame2 Frame3 Check1 Text1 Text2 Text3 Command1 Command2
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Property Caption Caption Font Caption Caption Caption Caption Value Caption Caption Value Caption Caption Value Caption Caption Caption Caption Caption Text Text Text Caption Caption
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Value Temperature Conversion Temperature Conversion MS Sans Serif, 12-point Enter original temperature in degrees Fahrenheit Equivalent temperature in degrees Celsius Absolute temperature in degrees Kelvin Fahrenheit to Celsius True Celsius to Fahrenheit Full precision True Nearest integer Large font True Small font Conversion type Precision Font size Display absolute temperature (blank) (blank) (blank) Go End
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Fig. 4.25 shows the resulting appearance of the Form Design Window. We now add the event procedures. Each of the first two option buttons (Fahrenheit to Celsius and Celsius to Fahrenheit) will have an event procedure associated with it, as in the previous example. Now, however, each event procedure will specify three labels rather than two the additional label indicating the units for the absolute temperature (degrees Kelvin or degrees Rankine). The event procedure associated with the first command button (Go) calculates and formats the equivalent temperature and the corresponding absolute temperature. Note that the absolute temperature is assigned to the temporary string variable T. Then at the end of the event procedure, Text3.Text (which is actually displayed) is either assigned the string represented by T, or an empty (blank) string, depending on whether or not the absolute temperature is displayed. In other words, if the check box has been checked, so that Check1.Value = 1, then the string represented by T is assigned to Text3.Text, and the absolute temperature (along with its accompanying label, Label4.Caption) will appear on the form. If the check box has not been checked, however, then Check1.Value will equal 0, and an empty (blank) string will be assigned to Text3.Text. In this case, the accompanying label (Label4.Caption) also will not appear. The event procedures are shown beneath Fig. 4.25.
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Fig. 4.25
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 = "" Label4.Caption = "Absolute temperature in degrees Kelvin" Text3.Text = "" End If End Sub 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 = "" Label4.Caption = "Absolute temperature in degrees Rankine" Text3.Text = "" End If End Sub
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Private Sub Command1_Click() Dim TempIn As Double, TempOut As Double, AbsTemp As Double, T As String TempIn = Val(Text1.Text) If (Option1 = True) Then TempOut = (5 / 9) * (TempIn - 32) AbsTemp = TempOut + 273.15 Else TempOut = 1.8 * TempIn + 32 AbsTemp = TempOut + 459.67 End If Text2.Text = Str(TempOut) T = Str(AbsTemp) If (Option4.Value = True) Then Text2.Text = Str(Format(TempOut, "#.")) T = Str(Format(AbsTemp, "#.")) End If Text2.FontSize = 8 Text3.FontSize = 8 If (Option5.Value = True) Then Text2.FontSize = 12 Text3.FontSize = 12 End If If (Check1.Value = 1) Then Label4.Visible = True Text3.Text = T ElseIf (Check1.Value = 0) Then Label4.Visible = False Text3.Text = "" End If End Sub Private Sub Command2_Click() End End Sub
Fig. 4.26 shows a conversion of 40 degrees Fahrenheit to 4.4444 degrees Celsius and 277.59 degrees Kelvin (absolute). Note that the results are displayed in full precision, using large (12-point) fonts. In Fig. 4.27, we see the result of converting 28 degrees Celsius to 82 degrees Fahrenheit. In this case, the absolute temperature is not requested (the check box is unselected, the text box is blank, and the accompanying label is not shown). Also, the converted temperature is shown in a small (8-point) font, rounded to the nearest integer.
4.11 SELECTING FROM A LIST (LIST BOXES AND COMBO BOXES) A list box offers another approach to selecting among several different alternatives. Each alternative can be identified as a single entry within the list. When the program is executed, clicking on a list entry will cause the value of the list index to be assigned to the ListIndex property. (The list index is an integer whose value ranges from 0 to n 1, where n is the number of entries within the list. Thus, the first item will correspond to index number 0, the second will correspond to index number 1, and so on.) An If-Then-Else block or a Select Case structure can then be used to carry out the desired action.
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