顯示100以內(nèi)所有素?cái)?shù) VB.net語言

‘這個(gè)是可以選擇范圍的查找

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Public?Class?Form1

'一個(gè)大于1的自然數(shù)，除了1和它本身外，不能被整除以其他自然數(shù)（質(zhì)數(shù)），換句話說就是該數(shù)除了1和它本身以外不再有其他的因數(shù)

'?章魚哥?3107073263

Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click

Dim?PD?As?Boolean?=?True

TextBox1.Clear()?'首先清空文本框，這里面將放置符合條件的素?cái)?shù)

If?NumericUpDown1.Value??NumericUpDown2.Value?Then?'從小到大

For?i?=?NumericUpDown1.Value?To?NumericUpDown2.Value?'循壞判斷所有數(shù)

For?j?=?2?To?i?-?1?'內(nèi)循環(huán)是除了1和它本身的

If?i?Mod?j?=?0?Then?'判斷是否能被除了1和自身以為的?比自身小的數(shù)整除

PD?=?False?'如果能被整除，將PD?設(shè)置為False

Exit?For?'退出里層For?循環(huán)

Else

PD?=?True

End?If

Next

If?PD?Then?'如果PD為True?，則為素?cái)?shù)

TextBox1.Text?=?i??"??"

End?If

Next

End?If

End?Sub

End?Class

vb.net利用doloop until 計(jì)算從1開始的素?cái)?shù)之和直到和不大于989為止

Module?Module1

Sub?Main()

Dim?sum?As?Integer?=?0

Dim?Bound?As?Integer?=?989

Dim?num?As?Integer?=?0

Dim?cprime?As?Integer?=?0

Do

num?+=?1

If?IsPrame(num)?Then

sum?+=?num

cprime?=?num

End?If

Loop?Until?sum??Bound

Console.WriteLine(sum?-?cprime)

Console.ReadKey()

End?Sub

'判斷一個(gè)數(shù)是不是素?cái)?shù)

Public?Function?IsPrame(ByVal?num?As?Integer)?As?Boolean

If?num?=?1?Then?Return?False?'素?cái)?shù)的定義是大于1

For?i?=?2?To?CType(Int(Math.Sqrt(num)),?Integer)

If?num?Mod?i?=?0?Then?Return?False

Next

Return?True

End?Function

End?Module

vb語言，輸入兩個(gè)數(shù)，輸出這兩個(gè)數(shù)中間所有的素?cái)?shù)

同意樓上的見解，

我在VB6.0中測(cè)試沒有問題，能看到輸出，VB.NET中也沒有問題。

不過是否還有點(diǎn)得注意：

Print j 這句是把找到的素?cái)?shù)以窗體的前景色(ForeColor)顯示在窗體上，你指的沒有輸出，是指在窗體上看不到內(nèi)容，是吧？是否你的窗體的前景色(ForeColor)與背景色(BackColor)相同或近似相同，造成視覺錯(cuò)誤呢？

vb.net的編程

Option Strict Off

Option Explicit On

Friend Class Form1

Inherits System.Windows.Forms.Form

Private Sub Command1_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles Command1.Click

Dim j As Integer

Dim A(9) As Short

Dim D(9) As Short

Dim i As Short

Dim B As Short

Dim C As Short

Dim F As Short

Dim G As Boolean

Dim H() As Short

Dim K As Short

Dim S As String

C = 32767

For i = 1 To 10

A(i - 1) = CShort(InputBox("輸入第 " i "個(gè)數(shù)"))

If B A(i - 1) Then B = A(i - 1)

If C A(i - 1) Then C = A(i - 1)

D(i - 1) = Int(Rnd() * 100 + 0.5)

If F D(i - 1) Then F = D(i - 1)

Next i

For i = 2 To 100

For j = 2 To Int(System.Math.Sqrt(i) + 0.5)

'UPGRADE_WARNING: Couldn't resolve default property of object j. Click for more: 'ms-help://MS.VSExpressCC.v80/dv_commoner/local/redirect.htm?keyword="6A50421D-15FE-4896-8A1B-2EC21E9037B2"'

'UPGRADE_WARNING: Mod has a new behavior. Click for more: 'ms-help://MS.VSExpressCC.v80/dv_commoner/local/redirect.htm?keyword="9B7D5ADD-D8FE-4819-A36C-6DEDAF088CC7"'

If i Mod j 0 Then

G = True

Else

G = False

Exit For

End If

Next j

If G = True Then

ReDim Preserve H(K)

H(K) = i

K = K + 1

End If

Next i

S = "2;"

For i = 0 To K - 1

S = S H(i) ";"

Next i

MsgBox("最大數(shù)為：" B "；最小數(shù)為：" C)

MsgBox("最大的隨機(jī)數(shù)為：" F)

MsgBox("1--100之間共有" K + 1 "個(gè)素?cái)?shù)：" S)

End Sub

End Class

vb判斷素?cái)?shù)需要添加哪些控件

vb判斷素?cái)?shù)需要添加的控件有button和listbox。

1、打開vb工程，在上面建一個(gè)窗體，然后創(chuàng)建button和listbox

2、在findPrime上寫入如下代碼：

Private Sub CommandButton1_Click()

Dim flag As Boolean

flag = True

ListBox1.AddItem (1) '默認(rèn)1和2都是素?cái)?shù)

ListBox1.AddItem (2)

For i = 1 To 1000

For J = 2 To i - 1

If (i Mod J = 0) Then

flag = True

Exit For

Else

flag = False

End If

Next

If flag = False Then

ListBox1.AddItem (i)

End If

Next i

End Sub

3、運(yùn)行結(jié)果，列出了1-1000內(nèi)的所有素?cái)?shù)。

VB:求出100以內(nèi)所有素?cái)?shù)的和，并將結(jié)果輸出到窗體上，并存入所給變量SUM中

Private Sub Command1_Click()

Dim i As Integer

Dim sum As Integer

For i = 1 To 100

If Prime(i) Then

sum = sum + i

End If

Next

Print "100以內(nèi)所有素?cái)?shù)的和是" sum

End Sub

Private Function Prime(ByVal n As Integer) As Boolean

Dim i As Integer

If n 2 Then

Prime = False

Exit Function

End If

For i = 2 To Sqr(n)

If n Mod i = 0 Then

Prime = False

Exit Function

End If

Next

Prime = True

End Function