九种求和方法

（一） Option Explicit


Private Sub Command1_Click()
Dim i As Integer
Dim a(10) As Integer


Dim sum As Integer


Randomize
For i = 1 To 10
    a(i) = Int(Rnd * 1000) + 1
    sum = sum + a(i)
Next i
Print sum


End Sub
（二） Private Sub Command1_Click()
Cls
Dim n As Integer, s As Integer
Dim a(10) As Integer
n = 1
While n <= 10
a(n) = Int(Rnd * 1000)
n = n + 1
Wend
n = 1
While n <= 10
Print a(n)
n = n + 1
Wend
s = 0
n = 1
While n <= 10
s = s + a(n)
n = n + 1
Wend
Print s
End Sub
（三） Dim sum As Integer
Dim i As Integer
Dim a As Integer
Private Sub Command1_Click()
    sum = 0
    For i = 1 To 10
    Randomize
        a = Int(1000 * Rnd)
        sum = sum + a
        MsgBox "10个随机数和为:" & sum
            Next
            


End Sub
（四）Dim sum As Integer
Dim i As Integer
Dim a As Integer
Private Sub Command1_Click()
    sum = 0
    For i = 1 To 10
        Randomize
        a = Int(1000 * Rnd)
        sum = sum + a
        
    Next
    
    MsgBox "10个随机数和为:" & sum
    
    Do While i <= 10
       Randomize
       a = Int(1000 * Rnd)
       sum = sum + a
       MsgBox "10个随机数和为:" & sum
       Loop
       
    
    
End Sub
（五） Dim sum As Integer
Dim i As Integer
Dim a As Integer
Private Sub Command1_Click()
    sum = 0
    For i = 1 To 10
        Randomize
        a = Int(1000 * Rnd)
        sum = sum + a
        
    Next
    
    MsgBox "10个随机数和为:" & sum
    
    i = 1
    Do Until i > 10
    Randomize
    a = Int(1000 * Rnd)
    sum = sum + a
    i = i + 1
    Loop
    MsgBox "10个随机数和为:" & sum
    
    
End Sub
（六） Dim sum As Integer
Dim i As Integer
Dim a As Integer
Private Sub Command1_Click()
i = 1
Do
   Randomize
   a = Int(1000 * Rnd)
   sum = sum + a
   i = i + 1
Loop While i <= 10
MsgBox "10个随机数和为:" & sum


i = 1
Do
   Randomize
   a = Int(1000 * Rnd)
   sum = sum + a
   i = i + 1
Loop Until i > 10
MsgBox "10个随机数和为:" & sum


End Sub
（七）Private Sub Command1_Click()
    Cls
    Font.Size = 70
    Print f(100)
    
End Sub
Private Function f(x As Integer) As Long
    If x = 1 Then
        f = x
    Else
        f = x + f(x - 1)
    End If
    
End Function
（八） Dim sum As Integer
Dim i As Integer
Dim a As Integer
Private Sub Command1_Click()
i = 1
Do
   Randomize
   a = Int(1000 * Rnd)
   sum = sum + a
   i = i + 1
Loop While i <= 10
MsgBox "10个随机数和为:" & sum






End Sub
（九）Dim sum As Integer
Dim a As Integer
Dim i As Integer


Private Sub Command1_Click()
i = 1
Do
   Randomize
   a = Int(1000 * Rnd)
   sum = sum + a
   i = i + 1
Loop Until i > 10
MsgBox "10个随机数和为:" & sum
End Sub