VB 解一元二次方程程序设计

vb代码如下：

Private Sub Command1_Click()
Dim a As Single, b As Single, c As Single
Dim d As Single, x1 As Single, x2 As Single
a = InputBox("请输入一元二次方程的系数a")
b = InputBox("请输入一元二次方程的系数b")
c = InputBox("请输入一元二次方程的系数c")
If a = 0 Then
a = InputBox("因为a≠0，你输入的a＝0，请重新输入系数a")
End If
d = b * b - 4 * a * c
If d >= 0 Then
x1 = (-b + Sqr(d)) / (2 * a)
x2 = (-b - Sqr(d)) / (2 * a)
Print "系数为"; a; b; c; "的一元二次方程的根分别为"; x1
Print "系数为"; a; b; c; "的一元二次方程的根分别为"; x2
Else
Print "此方程在实数范围内无解"
End If
End Sub

一、按钮“求一元二次方程”的vb代码如下：
Private Sub Command1_Click()
a = Text1.Text
b = Text2.Text
c = Text3.Text
d = b * b - 4 * a * c
If d >= 0 Then
X1 = (-b + Sqr(d)) / (2 * a)
X2 = (-b - Sqr(d)) / (2 * a)
Label4.Caption = X1
Label5.Caption = X2