vb程序对称数怎么输出

时间:2025-01-27 00:23:13 单机游戏

在VB程序中输出对称数,可以通过以下几种方法实现:

方法一:检查数字是否为回文

可以通过编写一个函数来检查一个数字是否为回文,然后输出所有满足条件的数字。

```vb

Private Function IsPalindrome(ByVal number As Integer) As Boolean

Dim reversed As String = New String(number.ToString().ToCharArray().Reverse())

Return number.ToString() = reversed

End Function

Private Sub Command1_Click()

Dim i As Integer

For i = 1 To 999

If IsPalindrome(i) Then

Print i

End If

Next

End Sub

```

方法二:生成对称数

可以编写一个程序生成对称数,例如输出形式为“1 3 …… n-2 n n-2 3 1”的对称数字串。

```vb

Private Sub Command1_Click()

Dim n As Integer

Dim i As Integer

Dim s As String

n = Text1.Text

s = ""

For i = 1 To n \ 2 + 1

s = s & i

Next

For i = 1 To n \ 2

s = s & n - i + 1

Next

s = s & s.Substring(0, s.Length - 1)

Text2.Text = s

End Sub

```

方法三:输出对称数序列

可以编写一个程序输出对称数序列,例如输出1到n的所有对称数。

```vb

Private Sub Command1_Click()

Dim n As Integer

Dim i As Integer

Dim s As String

n = Text1.Text

s = ""

For i = 1 To n \ 2 + 1

s = s & i

Next

For i = 1 To n \ 2

s = s & n - i + 1

Next

s = s & s.Substring(0, s.Length - 1)

Text2.Text = s

End Sub

```

方法四:输出对称数对

可以编写一个程序输出对称数对,例如输出所有形如i和n+2013-i的对称数。

```vb

Private Sub Command1_Click()

Dim i As Integer

For i = 1 To 999

If IsPalindrome(i + 2013) Then

Print i

End If

Next

End Sub

```

方法五:输出对称数三元组

可以编写一个程序输出对称数三元组,例如输出所有形如(i, j, k)的对称数,其中i + j + k = n且i <= j <= k。

```vb

Private Sub Command1_Click()

Dim n As Integer

Dim i As Integer

Dim j As Integer

Dim k As Integer

n = Text1.Text

For i = 1 To n \ 3 + 1

For j = i To n \ 2 - i + 1

k = n - i - j

If i <= j And j <= k And IsPalindrome(i + 2013) And IsPalindrome(j + 2013) And IsPalindrome(k + 2013) Then

Print i, j, k

End If

Next j

Next i

End Sub

```

这些方法可以根据具体需求选择使用,以实现对称数的输出。