vb组合数公式

Module Module1

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Private Sub fac(ByVal x As ULong,ByRef y As ULong)

Dim i,a

a = 1

For i = 1 To x

a = a * i

Next i

y = a

End Sub

Sub Main()

Dim m,n,Cmn,c1,c2,c3

Console.WriteLine("m=")

m = Val(Console.ReadLine())

Console.WriteLine("n=")

n = Val(Console.ReadLine())

Call fac(m,c1) :Call fac(n,c2) :Call fac(m - n,c3)

Cmn = c1 / (c2 * c3)

Console.Write("Cmn={0}",Cmn)

End Sub

End Module

VB.NET2010 给定求组合数公式为Cmn=m!/n!(m-n)!，编一程序，输入m和n的值，求Cmn的值。要用Sub过程

Module Module1

Private Sub fac(ByVal x As ULong, ByRef y As ULong)

Dim i, a

a = 1

For i = 1 To x

a = a * i

Next i

y = a

End Sub

Sub Main()

Dim m, n, Cmn, c1, c2, c3

Console.WriteLine("m=")

m = Val(Console.ReadLine())

Console.WriteLine("n=")

n = Val(Console.ReadLine())

Call fac(m, c1) : Call fac(n, c2) : Call fac(m - n, c3)

Cmn = c1 / (c2 * c3)

Console.Write("Cmn={0}", Cmn)

End Sub

End Module

vb.net程序。求组合数，其中m,n用inputbox函数输入。要求用用户自定义过程计算阶乘，组

Public Class Form1

Private Function jc1(ByVal q)

Dim i%, p%

p = 1

For i = 1 To q Step 1

p = p * i

Next

Return p

End Function

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

Dim m!, n!, info1$, info2, C!, title$

title = "组合数计算小能手"

info1 = "请输入m的值"

info2 = "请输入n的值"

m = Val(InputBox(info1, title))

n = Val(InputBox(info2, title))

C = jc1(m) / jc1(n) / jc1(m - n)

Label1.Text = "结果是" " " C

End Sub

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