论坛 › www.fea-league.com › 几个快速小程序vb代码

ysr 发表于 2021-2-3 17:55

这个就是用前面的程序很快就算出来了，我的大整数的乘法是模仿手工计算的效率慢，但仍然很快就算出来了估计就是几秒钟时间。

ysr 发表于 2021-2-5 18:48

能算出来上万位的整数的快速幂程序代码如下：

Private Sub Command1_Click()
Dim a, b
a = Text1: b = Text2
If b = 1 Then
Text3 = a
ElseIf b = 0 Then
Text3 = 1
Else
a1 = a
Do While b > 1
s = Int(Log(b) / Log(2))
s1 = 0
Do While s1 < s
a = MbC(Trim(a), Trim(a))
s1 = s1 + 1
Loop
a2 = a
b = b - 2 ^ s
a = a1
If s2 > 0 Then
a3 = MbC(Trim(a3), Trim(a2))
Else
a3 = a2
End If
s2 = s2 + 1
Loop
If b = 1 Then
Text3 = MbC(Trim(a3), Trim(a1))
Else
Text3 = a3
End If
s3 = Len(Text3)
Text3 = Text3 & "有" & s3 & "位"
End If
End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
Text3 = ""

End Sub

Public Function MbC(D1 As String, D2 As String) As String '乘法
Dim x, Y '两数长度
x = Len(D1): Y = Len(D2)
Dim a() As Integer
ReDim a(1 To x + Y, 1 To Y)
Dim I, J, C1, C2, CJ, JW
For J = Y To 1 Step -1 'D2
JW = 0 '进位清0
C2 = Mid$(D2, J, 1) '每位数
For I = x To 1 Step -1 'D1
C1 = Mid$(D1, I, 1) '每位数
CJ = C1 * C2 + JW '计算乘积
c = I + J: r = Y + 1 - J
a(c, r) = CJ Mod 10 '本位
JW = CJ \ 10 '进位
Next
a(c - 1, r) = JW
Next
Dim b() As Integer
ReDim b(1 To x + Y)
JW = 0
For I = x + Y To 1 Step -1
Bit = JW
For J = 1 To Y
Bit = Bit + a(I, J)
Next
b(I) = Bit Mod 10
JW = Bit \ 10
Next
If b(1) > 0 Then
MbC = MbC & b(1)
Else
MbC = MbC
End If
For I = 2 To x + Y
MbC = MbC & b(I)
Next
End Function

ysr 发表于 2021-2-5 23:44

大数除法之迭代法
除法：u/y=u*(1/y)；

      先讲一下倒数迭代式：x1=(2-y*x0)*x0,x0是y的倒数的近似值，它必须要小于y的倒数。另外迭代式中的乘法子程序要选用快速乘法（如FFT算法的乘法子程序）。

      否则迭代法的除法速度是很慢的，远远小于估商法。
例：求 6666666/23333 。
转换问题变成求 6.666666/2.3333*10^2 。先求 1/2.333，初值设为 10/23=0.4 ,
第一次迭代： x=0.4
第二次迭代： x=0.426
第三次迭代： x=0.4285620
第四次迭代：x=0.42857755……
第五次迭代 :x=0.42857755……
需要注意的是最后的答案只有一半的位数是正确的，计算答案得到 6666666/23333=285.71833……。

ysr 发表于 2021-2-6 00:11

本帖最后由 ysr 于 2021-2-6 00:58 编辑

实现细节：

1.为了方便可以将整数转换成多项式：a0+a1*10^-1+a2*10^-2+…………
2.类似多项式求逆，每一次计算时只需要取 b 的前 n 位参加计算，同样答案需要舍弃后面的位数。（可以直接把b的位数写全，这样稍慢些但编程简单）
3.迭代初值在 （0，2/b） 收敛，那么初值可以设置为答案的第一位（例如 b=7时初值设为 0.1 , b=1.23时，初值设为 0.8）。
例如上例中：
第一次迭代：x=x（2-x*2.3）=0.4
第二次迭代：x=x（2-x*2.33）=0.426
………………

ysr 发表于 2021-2-6 00:54

验证了一下，整数部分是准确的。小数部分如何更准确，待研究了。

ysr 发表于 2021-2-6 07:07

这回准确了，小数点后也准确，代码如下：

Private Sub Command1_Click()
Dim a, b
a = Text1: b = Text2: b3 = b
If Len(b) = 1 Then
X1 = Mid(b, 1, 1): X2 = 1 / X1
Else
X1 = Mid(b, 1, 2): X2 = 10 / X1
End If
x = Mid(X2, 1, 4)
y = 0: x3 = 0
If Len(b) = 1 Then
b = b
Else
b1 = Mid(b, 1, 1)
b2 = Mid(b, 2)
b = b1 & "." & b2
End If

Do While Abs(x3 - x) >= 0.0000000001

Print x
y = Val(x * (2 - b * x))
x3 = x
x = Val(y)
Loop
a1 = Mid(a, 1, Len(a) - Len(b3) + 1)
a2 = Right(a, Len(b3) - 1)
a = a1 & "." & a2
Print a
s = Len(a) - Len(b3)
Text3 = a * y
End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
Text3 = ""

End Sub

ysr 发表于 2021-2-15 23:44

本帖最后由 ysr 于 2021-2-16 03:07 编辑

公式法求勾股数的程序，求a^2+b^2=c^2，且满足a+b=k的整数解：

Private Sub Command1_Click()
Dim a, b, x, y, z, m
m = Text2
b1 = m / 2
b2 = b1 / 3
s1 = 0
Do While t < Val(b2) + 2
t = t + 1
b = 0
Do While t * b ^ 2 < Val(b1) + 2
a = b
b = b + 1
Do While t * a ^ 2 < Val(m)
a = a + 1
x = t * (a ^ 2 - b ^ 2)
y = 2 * a * b * t
z = Sqr(x ^ 2 + y ^ 2)
If InStr(z, ".") = 0 And x + y = Val(m) Then
m1 = (x + z) / 2
m2 = Sqr(m1)
s = s & "/解/" & x & "/" & y & "/" & z & "其中(x + z) / 2=" & m1 & "其方根为：" & m2 & vbCrLf
s1 = s1 + 1
Else
s1 = s1
End If
Loop
Loop
Loop


Text1 = Text1 & "当x+y=" & m & "有" & s1 + s2 & "组解： " & s
End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
Form1.Cls
End Sub

ysr 发表于 2021-2-17 10:52

本帖最后由 ysr 于 2021-2-17 04:58 编辑

如下除法程序小数点位置不对，需要改进：（修改了一下，这回小数点对了）
Private Sub Command1_Click() '快速除法程序
Dim a, b
a = Trim(Text1): b = Trim(Text2): b3 = b: a3 = a
If Len(b) = 1 Then
X1 = Mid(b, 1, 1): X2 = 1 / X1 - 0.01
Else
X1 = Mid(b, 1, 2): X2 = 10 / X1 - 0.01
End If
x = Mid(X2, 1, 4)
Y = 0: x3 = 0
sb = Len(a3) + Len(b3) - 1 + 10
a = a & String(20 + 2 * Len(a3), "0"): b = b & String(10 + Len(a3), "0")
x = qdqd0(ydxsd(Trim(x), Val(sb)))
Y1 = 2 & String(Val(sb), "0")
Do While MBJC(MPC(Trim(x), Trim(x3)), 1) >= 0
x6 = MPC(Trim(x), Trim(x3))
s3 = s3 + 1
Print x3, x
Y = mbc2(Trim(x), MPC(Trim(Y1), mbc2(Trim(b), Trim(x), Val(sb))), Val(sb))
x3 = x
x = Trim(Y)
Loop
a1 = mbc2(Trim(Y), Trim(a), Val(sb))
s = Len(a3) - Len(b3)
a1 = qdqd0(Trim(a1))
If Len(b3) = 1 Then
a1 = tjxsd(Trim(a1), Len(a1) - s)
Else
a1 = tjxsd(Trim(a1), Len(a1) - s - 1)
End If
Text3 = a1
End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
Text3 = ""

End Sub
Private Function mbc2(sa As String, sb As String, sd As String) As String 'chengfa jingdu
Dim ja

If sa = 0 Or sb = 0 Then
mbc2 = 0
Else


ja = MbC(Trim(sa), Trim(sb))
If Val(Len(ja)) > Val(sd) Then
jb = Left(ja, Val(Len(ja)) - Val(sd))
mbc2 = jb
Else
mbc2 = 0
End If


End If




End Function


Private Function qdqd0(sa As String) As String
a = sa
Do While Left(a, 1) = "0"
a = Mid(a, 2)
Loop
If a = "" Then
a = 0
Else
a = a
End If
qdqd0 = a
End Function

Private Function tjxsd(sa As String, sd As String) As String
If Val(Len(sa)) > Val(sd) Then
tjxsd = Left(sa, Val(Len(sa)) - Val(sd)) & "." & Mid(sa, Val(Len(sa)) - Val(sd) + 1)
Else
If Val(Len(sa)) = Val(sd) Then
tjxsd = "0." & sa
Else
tjxsd = "0." & String(Val(sd) - Val(Len(sa)), "0") & Trim(sa)
End If
End If

End Function

Private Function ydxsd(sa As String, sd As String) As String
If Len(sa) = 1 And Val(sa) = 0 Then
ydxsd = 0
Else

    sc = InStr(sa, ".")
    If Val(sc) = 0 Then
    ydxsd = sa & String(sd, "0")
    Else
    se = Left(sa, Val(sc) - 1)
    sf = Right(sa, Len(sa) - Val(sc))
    If Val(Len(sf)) >= Val(sd) Then
    ydxsd = se & Mid(sf, 1, sd)
      Else
      ydxsd = se & sf & String(Val(sd) - Len(sf), "0")
      End If
      End If
      End If
      End Function
      
      Public Function MbC(D1 As String, D2 As String) As String '乘法
Dim x, Y '两数长度
x = Len(D1): Y = Len(D2)
Dim a() As Integer
ReDim a(1 To x + Y, 1 To Y)
Dim I, J, C1, C2, CJ, JW
For J = Y To 1 Step -1 'D2
JW = 0 '进位清0
C2 = Mid$(D2, J, 1) '每位数
For I = x To 1 Step -1 'D1
C1 = Mid$(D1, I, 1) '每位数
CJ = C1 * C2 + JW '计算乘积
c = I + J: r = Y + 1 - J
a(c, r) = CJ Mod 10 '本位
JW = CJ \ 10 '进位
Next
a(c - 1, r) = JW
Next
Dim b() As Integer
ReDim b(1 To x + Y)
JW = 0
For I = x + Y To 1 Step -1
Bit = JW
For J = 1 To Y
Bit = Bit + a(I, J)
Next
b(I) = Bit Mod 10
JW = Bit \ 10
Next
If b(1) > 0 Then
MbC = MbC & b(1)
Else
MbC = MbC
End If
For I = 2 To x + Y
MbC = MbC & b(I)
Next
End Function

Public Function MPC(D1 As String, D2 As String) As String ';jianfaqi
Dim x, Y ';两数长度
If Len(D1) >= Len(D2) Then
D4 = String(Len(D1) - Len(D2), "0") & D2
d3 = D1
Else
D4 = D2
d3 = String(Len(D2) - Len(D1), "0") & D1
End If
x = Len(d3): Y = Len(D4)
Dim a() As Integer, B1() As Integer, C1() As Integer, E1() As Integer
ReDim a(1 To x)
ReDim B1(1 To Y)
ReDim C1(1 To x)
ReDim E1(1 To x)
Dim I, J, C2, CJ, JW
For J = Y To 1 Step -1 ';D2
JW = 1 ';yu jie weichuzhi
B1(J) = Mid(D4, J, 1) ';每位数
For I = x To 1 Step -1';D1
   a(I) = Mid(d3, I, 1) ';每位数
   C1(I) = 10 + a(I) - B1(I) - 1 + JW ';计算jia
   JW = C1(I) \ 10
   E1(I) = C1(I) Mod 10
Next
Next
For r = 1 To x
MPC = MPC & E1(r)
For I = 1 To Len(MPC)
    If Not Mid(MPC, I, 1) = "0" Then
      Exit For
    End If
Next
strtmp = Mid(MPC, I)
If Len(strtmp) = 0 Then
MPC = "0"
Else
MPC = strtmp
End If
Next


End Function
Public Function MPC1(D1 As String, D2 As String) As String 'jiafa
Dim x, Y '两数长度

If Len(D1) >= Len(D2) Then
D4 = String(Len(D1) - Len(D2), "0") & D2
d3 = D1
Else
D4 = D2
d3 = String(Len(D2) - Len(D1), "0") & D1
End If
x = Len(d3): Y = Len(D4)
Dim a() As Integer, B1() As Integer, C1() As Integer, E1() As Integer
ReDim a(1 To x)
ReDim B1(1 To Y)
ReDim C1(1 To x)
ReDim E1(1 To x)
Dim I, J, C2, CJ, JW
For J = Y To 1 Step -1 'D2
JW = 0 '进位清0
B1(J) = Mid$(D4, J, 1) '每位数
For I = x To 1 Step -1'D1
   a(I) = Mid$(d3, I, 1) '每位数
   C1(I) = a(I) + B1(I) + JW '计算jia
   JW = C1(I) \ 10
   E1(I) = C1(I) Mod 10
Next
Next
For r = 1 To x
If JW = 0 Then
MPC1 = MPC1 & E1(r)
Else
jc = jc & E1(r)
MPC1 = JW & jc
End If
Next

End Function

Public Function MBJC(D1 As String, D2 As String) As String ';bijiao
If Len(D1) <= 10 And Len(D2) <= 10 Then
If Val(D1) > Val(D2) Then
MBJC = 1
Else
If Val(D1) = Val(D2) Then
MBJC = 0
Else
MBJC = -1
End If
End If
Else

If Len(D1) > Len(D2) Then
MBJC = 1
Else
If Len(D1) < Len(D2) Then
MBJC = -1
Else
If Len(D1) = Len(D2) Then
Dim x, Y
x = Len(D1) \ 4: Y = Len(D2) \ 4
Dim a() As String, b() As String
ReDim a(4 To 4 * x + 4)
ReDim b(4 To 4 * Y + 4)
If Val(Left(D1, Len(D1) - 4 * x)) > Val(Left(D2, Len(D2) - 4 * Y)) Then
   MBJC = 1
   Else
   If Val(Left(D1, Len(D1) - 4 * x)) < Val(Left(D2, Len(D2) - 4 * Y)) Then
   MBJC = -1
   Else
   For I = 4 To 4 * x Step 4
   a(I) = Mid(D1, Len(D1) - I + 1, 4)
   b(I) = Mid(D2, Len(D2) - I + 1, 4)
   Next
   J = 4 * x
   Do While a(J) = b(J) And J >= 8
   
   J = J - 4
      Loop
      
      
    If Val(a(J)) - Val(b(J)) > 0 Then
    MBJC = 1
    Else
    If Val(a(J)) - Val(b(J)) < 0 Then
    MBJC = -1
    Else
    MBJC = 0
    End If
   
   End If
   
   
   
End If
End If
End If
End If
End If
End If
End Function

ysr 发表于 2021-2-17 15:11

本帖最后由 ysr 于 2021-2-18 14:21 编辑

只输出整数部分和余数的快速除法程序，几百位的整数可以瞬间完成，最大不知道算到多少位：
（其中的乘法是模仿手工计算的速度慢，所以还有很大的提升空间）（不知道有没有错误的情况，欢迎试用和批评指导！）(修改了一下，关键是移动小数点有一类错误，已经改好，谁知道还有没有错误的类型？)

Private Sub Command1_Click() '快速除法程序
Dim a, b
a = Trim(Text1): b = Trim(Text2): b3 = b: a3 = a
If Len(b) = 1 Then
X1 = Mid(b, 1, 1): X2 = 1 / X1 - 0.01
Else
X1 = Mid(b, 1, 2): X2 = 10 / X1 - 0.01
End If
x = Mid(X2, 1, 4)
Y = 0: x3 = 0
sb = Len(a3) + Len(b3) - 1 + 10
If Len(a3) = Len(b3) And MBJC(Trim(a3), Trim(b3)) = 0 Then
a1 = 1
ElseIf MBJC(Mid(a3, 1, Len(b3)), Trim(b3)) = 0 And Val(Len(qdhz0(Trim(a3)))) = Val(Len(b3)) Then
a1 = 1 & String(Len(a3) - Len(qdhz0(Trim(a3))), "0")
Else

a = a & String(10, "0"): b = b & String(10 + Len(a3), "0")
x = qdqd0(ydxsd(Trim(x), Val(sb)))
Y1 = 2 & String(Val(sb), "0")
Do While MBJC(MPC(Trim(x), Trim(x3)), 1) >= 0

s3 = s3 + 1
Y = mbc2(Trim(x), MPC(Trim(Y1), mbc2(Trim(b), Trim(x), Val(sb))), Val(sb))
x3 = x
x = Trim(Y)
Loop
a1 = mbc2(Trim(Y), Trim(a), Val(sb))
s = Len(a3) - Len(b3)
a1 = qdqd0(Trim(a1))

If MBJC(Mid(a3, 1, Len(b3)), Trim(b3)) < 0 Then
a1 = tjxsd(Trim(a1), Len(a1) - s)
Else
a1 = tjxsd(Trim(a1), Len(a1) - s - 1)
End If
End If

If InStr(a1, ".") = 0 Then
a1 = a1
Else
a1 = Left(a1, InStr(a1, ".") - 1)
End If
ja = MPC(Trim(a3), MbC(Trim(b3), Trim(a1)))
Do While MBJC(Trim(ja), Trim(b3)) >= 0
ja = MPC(Trim(ja), Trim(b3))
s5 = s5 + 1
Loop
a1 = MPC1(Trim(a1), Trim(s5))
If ja = 0 Then
Text3 = a1
Else
Text3 = a1 & "/" & ja
End If
End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
Text3 = ""

End Sub
Private Function mbc2(sa As String, sb As String, sd As String) As String 'chengfa jingdu
Dim ja

If Trim(sa) = 0 Or Trim(sb) = 0 Then
mbc2 = 0
Else


ja = MbC(Trim(sa), Trim(sb))
If Val(Len(ja)) > Val(sd) Then
jb = Left(ja, Val(Len(ja)) - Val(sd))
mbc2 = jb
Else
mbc2 = 0
End If


End If




End Function

Private Function qdhz0(sa As String) As String
a = sa
Do While Right(a, 1) = "0"
a = Left(a, Len(a) - 1)
Loop
If a = "" Then
a = 0
Else
a = a
End If
qdhz0 = a
End Function


Private Function qdqd0(sa As String) As String
a = sa
Do While Left(a, 1) = "0"
a = Mid(a, 2)
Loop
If a = "" Then
a = 0
Else
a = a
End If
qdqd0 = a
End Function

Private Function tjxsd(sa As String, sd As String) As String
If Val(Len(sa)) > Val(sd) Then
tjxsd = Left(sa, Val(Len(sa)) - Val(sd)) & "." & Mid(sa, Val(Len(sa)) - Val(sd) + 1)
Else
If Val(Len(sa)) = Val(sd) Then
    tjxsd = "0." & sa
    Else
    tjxsd = "0." & String(Val(sd) - Val(Len(sa)), "0") & Trim(sa)
    End If
    End If

End Function

Private Function ydxsd(sa As String, sd As String) As String
If Len(sa) = 1 And Val(sa) = 0 Then
    ydxsd = 0
    Else
   
      sc = InStr(sa, ".")
      If Val(sc) = 0 Then
      ydxsd = sa & String(sd, "0")
      Else
      se = Left(sa, Val(sc) - 1)
      sf = Right(sa, Len(sa) - Val(sc))
      If Val(Len(sf)) >= Val(sd) Then
      ydxsd = se & Mid(sf, 1, sd)
      Else
      ydxsd = se & sf & String(Val(sd) - Len(sf), "0")
      End If
      End If
      End If
      End Function
      
      Public Function MbC(D1 As String, D2 As String) As String '乘法
Dim x, Y '两数长度
x = Len(D1): Y = Len(D2)
Dim a() As Integer
ReDim a(1 To x + Y, 1 To Y)
Dim I, J, C1, C2, CJ, JW
For J = Y To 1 Step -1 'D2
JW = 0 '进位清0
C2 = Mid$(D2, J, 1) '每位数
For I = x To 1 Step -1 'D1
    C1 = Mid$(D1, I, 1) '每位数
CJ = C1 * C2 + JW '计算乘积
c = I + J: r = Y + 1 - J
    a(c, r) = CJ Mod 10 '本位
JW = CJ \ 10 '进位
Next
a(c - 1, r) = JW
Next
Dim b() As Integer
ReDim b(1 To x + Y)
JW = 0
For I = x + Y To 1 Step -1
Bit = JW
For J = 1 To Y
    Bit = Bit + a(I, J)
Next
b(I) = Bit Mod 10
JW = Bit \ 10
Next
If b(1) > 0 Then
MbC = MbC & b(1)
Else
MbC = MbC
End If
For I = 2 To x + Y
MbC = MbC & b(I)
Next
End Function

Public Function MPC(D1 As String, D2 As String) As String ';jianfaqi
Dim x, Y ';两数长度
If Len(D1) >= Len(D2) Then
D4 = String(Len(D1) - Len(D2), "0") & D2
d3 = D1
Else
D4 = D2
d3 = String(Len(D2) - Len(D1), "0") & D1
End If
x = Len(d3): Y = Len(D4)
Dim a() As Integer, B1() As Integer, C1() As Integer, E1() As Integer
ReDim a(1 To x)
ReDim B1(1 To Y)
ReDim C1(1 To x)
ReDim E1(1 To x)
Dim I, J, C2, CJ, JW
For J = Y To 1 Step -1 ';D2
JW = 1 ';yu jie weichuzhi
B1(J) = Mid(D4, J, 1) ';每位数
For I = x To 1 Step -1';D1
   a(I) = Mid(d3, I, 1) ';每位数
   C1(I) = 10 + a(I) - B1(I) - 1 + JW ';计算jia
   JW = C1(I) \ 10
   E1(I) = C1(I) Mod 10
    Next
    Next
    For r = 1 To x
    MPC = MPC & E1(r)
    For I = 1 To Len(MPC)
      If Not Mid(MPC, I, 1) = "0" Then
          Exit For
      End If
Next
strtmp = Mid(MPC, I)
    If Len(strtmp) = 0 Then
    MPC = "0"
    Else
MPC = strtmp
End If
    Next
   
   
End Function
    Public Function MPC1(D1 As String, D2 As String) As String 'jiafa
Dim x, Y '两数长度

If Len(D1) >= Len(D2) Then
D4 = String(Len(D1) - Len(D2), "0") & D2
d3 = D1
Else
D4 = D2
d3 = String(Len(D2) - Len(D1), "0") & D1
End If
x = Len(d3): Y = Len(D4)
Dim a() As Integer, B1() As Integer, C1() As Integer, E1() As Integer
ReDim a(1 To x)
ReDim B1(1 To Y)
ReDim C1(1 To x)
ReDim E1(1 To x)
Dim I, J, C2, CJ, JW
For J = Y To 1 Step -1 'D2
JW = 0 '进位清0
B1(J) = Mid$(D4, J, 1) '每位数
For I = x To 1 Step -1'D1
   a(I) = Mid$(d3, I, 1) '每位数
   C1(I) = a(I) + B1(I) + JW '计算jia
   JW = C1(I) \ 10
   E1(I) = C1(I) Mod 10
    Next
    Next
    For r = 1 To x
    If JW = 0 Then
    MPC1 = MPC1 & E1(r)
    Else
    jc = jc & E1(r)
    MPC1 = JW & jc
    End If
    Next
   
End Function

Public Function MBJC(D1 As String, D2 As String) As String ';bijiao
If Len(D1) <= 10 And Len(D2) <= 10 Then
If Val(D1) > Val(D2) Then
MBJC = 1
Else
If Val(D1) = Val(D2) Then
MBJC = 0
Else
MBJC = -1
End If
End If
Else

If Len(D1) > Len(D2) Then
MBJC = 1
Else
If Len(D1) < Len(D2) Then
MBJC = -1
Else
If Len(D1) = Len(D2) Then
Dim x, Y
x = Len(D1) \ 4: Y = Len(D2) \ 4
Dim a() As String, b() As String
ReDim a(4 To 4 * x + 4)
ReDim b(4 To 4 * Y + 4)
If Val(Left(D1, Len(D1) - 4 * x)) > Val(Left(D2, Len(D2) - 4 * Y)) Then
   MBJC = 1
   Else
   If Val(Left(D1, Len(D1) - 4 * x)) < Val(Left(D2, Len(D2) - 4 * Y)) Then
   MBJC = -1
   Else
   For I = 4 To 4 * x Step 4
   a(I) = Mid(D1, Len(D1) - I + 1, 4)
   b(I) = Mid(D2, Len(D2) - I + 1, 4)
   Next
   J = 4 * x
   Do While a(J) = b(J) And J >= 8
   
   J = J - 4
      Loop
      
      
      If Val(a(J)) - Val(b(J)) > 0 Then
      MBJC = 1
      Else
      If Val(a(J)) - Val(b(J)) < 0 Then
      MBJC = -1
      Else
      MBJC = 0
      End If
      
   End If
   
   
   
End If
End If
End If
End If
End If
End If
End Function

ysr 发表于 2021-3-2 01:24

哈哈哈！这回蒙对了！太激动了！下面是结果和程序代码：
输入：Text1=20403000,结果： 9+0i4.12132034355965+-6.12132034355964i-2+-3i-0.121320343559644+1.87867965644035i3+0i-0.121320343559638+-1.87867965644036i-2+3i4.12132034355963+6.12132034355965i.

代码如下：

Private Sub Command1_Click() '蝶形运算程序
Dim xr() As Double, a As String
a = Trim(Text1)
ReDim xr(0 To Len(a) - 1)
For i1 = 0 To Len(a) - 1
xr(i1) = Mid(a, i1 + 1, 1)
Next
Dim l As Long, le As Long, le1 As Long, n As Long, r As Long, p As Long, q As Long, m As Byte
Dim wr As Double, w1 As Double, wlr As Double, wl1 As Double, tr As Double, t1 As Double
Dim pi As Double, t As Double
Dim xi()
n = Len(a) '求数组大小，其值必须是2的幂
m = 0
l = 2
pi = 3.14159265358979
Do
l = l + l
m = m + 1
Loop Until l > n
n = l / 2
ReDim xi(n - 1)

l = 1
Do
le = 2 ^ l
le1 = le / 2
Print l
r = 0
Do
p = r
Do
   q = p + le1
   
   tr = xr(q) * Cos((-2 * pi / 2 ^ l) * r)
   ti = xr(q) * Sin((-2 * pi / 2 ^ l) * r)
   
   xr(q) = xr(p) - tr
   xi(q) = xi(p) - ti
   xr(p) = xr(p) + tr
   xi(p) = xi(p) + ti
   Print p, q
   
   Print xr(p); xi(p); r, xr(q); xi(q); r
   
   
   p = p + le
Loop Until p > n - 2


r = r + 1
Loop Until r > le1 - 1
l = l + 1
Loop Until l > m

For i = 0 To n - 1 '仅输出模
Print xr(i), xi(i)
   Text2 = Text2 & "" & xr(i) & "+" & xi(i) & "i"
   Next

End Sub

Private Sub Command2_Click()
Text1 = ""
Text2 = ""
End Sub

明天再说吧！

查看完整版本: 几个快速小程序vb代码