vb中二进制码如何转换

在VB中转换二进制数可通过以下方法实现，具体分为十进制转二进制和二进制转十进制两种情况：

一、十进制转二进制

使用内置函数

- `DecimalToBinary`函数：适用于将十进制数转换为二进制字符串。例如：

```vb

Sub DecimalToBinary()

Dim decimals() As Long

decimals = Array(10, 15, 20, 25)

Dim binary As String

For i = LBound(decimals) To UBound(decimals)

binary = binary & DecimalToBinary(decimals(i)) & " "

Next i

MsgBox binary

End Sub

```

- `DEC_to_BIN`函数：通过“除二取余”法实现转换。例如：

```vb

Public Function DEC_to_BIN(Dec As Long) As String

Dim s2 As String

Do While Dec > 0

s2 = Dec Mod 2 & s2

Dec = Dec 2

Loop

Return s2

End Function

```

手动实现算法

- 通过循环除以2记录余数，逆序拼接。例如：

```vb

Private Sub Command1_Click()

Dim s10 As Integer, s2 As String

s10 = Val(Text1.Text)

s2 = ""

Do While s10 > 0

s2 = s10 Mod 2 & s2

s10 = s10 2

Loop

Text2.Text = s2

End Sub

```

二、二进制转十进制

使用内置函数

- `BIN_to_DEC`函数：通过逐位加权求和实现转换。例如：

```vb

Public Function BIN_to_DEC(ByVal Bin As String) As Long

Dim s As Long, i As Integer

s = 0

For i = 1 To Len(Bin)

s = s * 2 + Val(Mid(Bin, i, 1))

Next i

Return s

End Function

```

手动实现算法

- 通过逐位乘以2的幂次求和。例如：

```vb

Private Sub Command2_Click()

Dim s As Long, i As Integer

s = 0

Dim BinStr As String = Text2.Text

For i = 1 To Len(BinStr)

s = s * 2 + Val(Mid(BinStr, i, 1))

Next i

Text1.Text = s

End Sub

```

三、注意事项

数据类型：

确保输入和输出数据类型匹配（如`Long`用于大数转换）。

错误处理：可添加输入验证，避免非数字字符导致错误。

效率优化：内置函数通常更高效，手动实现适合教学或特殊需求。