```vb
Module VB24Point
Sub Main()
Dim numbers(3) As Integer
Dim operators(3) As String
Dim result As Double
Dim i As Integer
Dim j As Integer
Dim k As Integer
Dim l As Integer
' 输入四个数字
Console.WriteLine("请输入四个数字(用空格分隔):")
For i = 0 To 3
numbers(i) = Convert.ToInt32(Console.ReadLine())
Next
' 生成所有可能的数字排列
For j = 0 To 3
For k = 0 To 3
For l = 0 To 3
If j <> k And j <> l And k <> l Then
' 交换数字位置
numbers(j), numbers(k) = numbers(k), numbers(j)
Exit For
End If
Next
Next
Next
' 生成所有可能的运算符组合
For j = 0 To 3
For k = 0 To 3
For l = 0 To 3
If j <> k And j <> l And k <> l Then
operators(j) = "+"
operators(k) = "-"
operators(l) = "*"
Exit For
End If
Next
Next
Next
' 穷举所有可能的表达式
For j = 0 To 3
For k = 0 To 3
For l = 0 To 3
If j <> k And j <> l And k <> l Then
' 计算当前表达式的结果
result = CalculateExpression(numbers(0), operators(0), numbers(1), operators(1), numbers(2), operators(2), numbers(3), operators(3))
If result = 24 Then
Console.WriteLine($"找到解:{numbers(0)}{operators(0)}{numbers(1)}{operators(1)}{numbers(2)}{operators(2)}{numbers(3)}{operators(3)} = 24")
Exit For
End If
End If
Next
Next
Next
Console.WriteLine("没有找到解。")
Console.ReadLine()
End Sub
Function CalculateExpression(ByVal a As Integer, ByVal op1 As String, ByVal b As Integer, ByVal op2 As String, ByVal c As Integer, ByVal op3 As String, ByVal d As Integer, ByVal op4 As String) As Double
Dim result As Double
Select Case op1
Case "+"
result = a + b
Case "-"
result = a - b
Case "*"
result = a * b
Case "/"
If b <> 0 Then
result = a / b
Else
Return Double.NaN
End If
Case Else
Return Double.NaN
End Select
result = result + c
Select Case op3
Case "+"
result = result + d
Case "-"
result = result - d
Case "*"
result = result * d
Case "/"
If d <> 0 Then
result = result / d
Else
Return Double.NaN
End If
Case Else
Return Double.NaN
End Select
result = result + op4
Select Case op4
Case "+"
result = result + d
Case "-"
result = result - d
Case "*"
result = result * d
Case "/"
If d <> 0 Then
result = result / d
Else
Return Double.NaN
End If
Case Else
Return Double.NaN
End Select
Return result
End Function
End Module
```
这个程序首先输入四个数字,然后生成所有可能的数字排列和运算符组合。接着,它通过调用 `CalculateExpression` 函数来计算每个表达式的结果,并检查结果是否为24。如果找到解,程序将输出该表达式。
请注意,这个程序是一个简单的示例,实际应用中可能需要考虑更多的优化和错误处理。