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vb 排序问题? 选择排序vb代码

vb 排序问题?选择排序vb代码

vb的排序问题

Option Explicit

Private Sub Command1_Click()

Dim a(10) As Integer, g%, t%

Static i%

For i = 1 To 10

a(i) = Val(InputBox("请输入第" & i & "个数"))

If a(i) = Empty Then Exit Sub

g = 0

g = g + a(i)

Next i

Print "你输入的数组是: "

For i = 1 To 10

Print a(i);

Next i

Print

Print "倒换后的数组: "

For i = 1 To 5

t = a(i): a(i) = a(10 - i + 1): a(10 - i + 1) = t

Next i

For i = 1 To 10

Print a(i);

Next i

End Sub

vb的排序问题

1、算法说明

  1) 选择法排序

  (1) 从n个数中选出最小数的下标,出了循环,将最小数与第一个数交换位置;

  (2) 除第一个数外,在剩下的n-1个数中再按方法(1)选出次小的数,与第二个数交换位置;

  (3) 以此类推,最后构成递增序列。

  譬如:

  8 6 9 3 2 7

  第一轮交换后 2 6 9 3 8 7

  第二轮交换后 2 3 9 6 8 7

  第三轮交换后 2 3 6 9 8 7

  第四轮交换后 2 3 6 7 8 9

  第五轮无交换 2 3 6 7 8 9

  程序代码如下:

以下是引用片段:

  Private Sub xzPaiXu(a() As Double, sheng As Boolean)

  'a为需要排序的数组,sheng为True则为升序排列,为False,则为降序排列。

  Dim i As Integer, j As Integer

  Dim temp As Double

  Dim m As Integer

  For i = LBound(a) To UBound(a) - 1 '进行数组大小-1轮比较

  m = i '在第i轮比较时,假定第

  'i个元素为最值元素

  For j = i + 1 To UBound(a) '在剩下的元素中找出最

  '值元素的下标并记录在m中

  If sheng Then '若为升序,则m记录最小元素

  '下标,否则记录最大元素下标

  If a(j) < a(m) Then m = j

  Else

  If a(j) > a(m) Then m = j

  End If

  Next j '将最值元素与第i个元素交换

  temp = a(i)

  a(i) = a(m)

  a(m) = temp

  Next i

  End Sub

  调用该过程示例:

  Option Base 1

  Private Sub Command1_Click()

  Dim b(6) As Double

  b(1) = 8

  b(2) = 6

  b(3) = 9

  b(4) = 3

  b(5) = 2

  b(6) = 7

  Call xzPaiXu(b, True)

  For i% = 1 To 6

  Print b(i)

  Next

  End Sub

  2) 冒泡法排序

  选择排序法在每一轮排序时找最值元素的下标,出了内循环(一轮排序结束),再交换最小数的位置;而冒泡法在每一轮排序时将相邻的数比较,当次序不对就交换位置,出了内循环,最值数已经冒出。

  譬如:

  8 6 9 3 2 7

  8 6 9 3 2 7

  8 6 9 2 3 7

  8 6 2 9 3 7

  8 2 6 9 3 7

  2 8 6 9 3 7

  ….

  2 3 8 6 9 7

  ….

  2 3 6 8 7 9

  ….

  2 3 6 7 8 9

  ….

  2 3 6 7 8 9

  程序代码如下:

以下是引用片段:

  Private Sub mpPaiXu(a() As Double, sheng As Boolean)

  'a为需要排序的数组,sheng为True则为升序排列,为False,则为降序排列。

  Dim i As Integer, j As Integer

  Dim temp As Double

  Dim m As Integer

  For i = LBound(a) To UBound(a) - 1 '进行n-1轮比较

  For j = UBound(a) To i + 1 Step -1 '从n到i个元素两两进行比较

  If sheng Then '若次序不对,马上进行交换

  If a(j) < a(j - 1) Then

  temp = a(j)

  a(j) = a(j - 1)

  a(j - 1) = temp

  End If

  Else

  If a(j) > a(j - 1) Then

  temp = a(j)

  a(j) = a(j - 1)

  a(j - 1) = temp

  End If

  End If

  Next j '出了内循环,一轮排序结束

  '最值元素冒到最上边

  Next i

  End Sub

  调用该过程代码基本同上。

  2、实战练习

  1) 补充代码

  下面是一个采用拉锯式排序法对数组元素按升序进行排序的程序,所谓“拉锯式排序法”是这一遍把最小的元素从下到上送到最上的位置,下一遍则是从上到下把最大的元素送到最下的位置。

以下是引用片段:

  Option Base 1

  Private Sub Command1_Click()

  Dim a(10) As Integer,i As Integer

  For i = 1 To 10

  a(i) = Int(Rnd * 10)+1

  Text1 = Text1 & Str(a(i))

  Next i

  Call shaker_sort(a)

  For i = 1 To 10

  Text2 = Text2 & Str(a(i))

  Next i

  End Sub

  Private Sub Shaker_sort(k() As Integer)

  Dim i As Integer,c As Integer,d As Integer

  Dim t As Integer

  c = 1

  d = (1)

  Do

  For  (2) Step-1

  If k(i=1)>k(i) Then

  t = k(i-1):k(i-1) = k(i):k(i) = t

  End If

  Next i

  (3)

  For i = c+1 To d

  If (4) Then

  t = k(i-1):k(i-1) = k(i):k(i) = t

  End If

  Next i

  d = d-1

  Loop While  (5)

  End Sub

  2) 编程题

  把文本框输入的字符串按降序添加到列表框中。

是否可以解决您的问题?

VB排序问题

Option Explicit

Private Sub Form_Click()

Dim a(1 To 10) As Integer, iMin%, n%, j%, t%, i%

Picture1.Print "产生的随机数为:"

Picture2.Print "按降序排列为:"

For i = 1 To 10

a(i) = Int(Rnd * 90 + 10)

Picture1.Print a(i)

Next i

n = UBound(a) '你这个地方错了,真是大意呀!

'排序我用的冒泡法,你的那个方法在第一次循环的时候imin是0,用F8的单步运行就会发现错在这里了,因为你的数组是从1开始的。

For i = 1 To n - 1

For j = i To n

If a(i) < a(j) Then

t = a(i)

a(i) = a(i)

a(j) = t

End If

Next j

Next i

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

Picture2.Print a(i)

Next

End Sub

vb程序设计,关于排序的问题

用冒泡排序

for i=1 to 5 do

for j=1 to 5-i do

if worker(j).pay>worker(j+1).pay then

t=work(j)

work(j)=work(j+1)

work(j+1)=t

end if

next j

next i