VB 程序设计题

编写一个求三个数最大值的函数max(x，y，z)，然后调用此函数求下列表达式的值，首先在文本框中输入a,b,c三个数，然后单击“计算”按钮，在文本框中输出表达式的值m。表达式为m=(max(a,b,c))/(max(a+b,b,c)Xmax(a,b,b+c))

Dim a As Integer
Dim b As Integer
Dim c As Integer

Private Sub Command1_Click()
Dim m As Single
m = (max(a, b, c)) / (max(a + b, b, c) * max(a, b, b + c))
Text1 = "m=" & Format(m, "0.0000")
End Sub

Private Sub Form_Load()
a = Val(InputBox("a="))
b = Val(InputBox("b="))
c = Val(InputBox("c="))
End Sub

Private Function max(ByVal x As Integer, ByVal y As Integer, ByVal z As Integer) As Integer
Dim t As Integer
If x > y Then t = x: x = y: y = t
If y > z Then t = y: y = z: z = t
If x > z Then t = x: x = z: z = t
max = z
End Function

控件: label1, label2, label3 text1, command1 代码: private sub command1_click() ' command1单击事件 label3.caption = text1.text end sub private sub form_load() ' 程序装载事件 label1.alignment = 2 ' 居中显示 label1.caption = "欢迎学习" & vbcrlf & "visualbasic" label3.borderstyle = 1 end sub 效果:

Function max(x As Single, y As Single, z As Single) As Single Dim m As Single If x > y Then m = x Else m = y End If If m < z Then m = z max = m End Function Private Sub Command1_Click() Dim sz As Variant, a As Single, b As Single, c As Single sz = Split(Text1.Text, ",") a = Val(sz(0)) b = Val(sz(1)) c = Val(sz(2)) m = max(a, b, c) / (max(a + b, b, c) * max(a, b, b + c)) Text1.Text = m End Sub

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