在小于100的正整数中共有多少个数能被3整除?这些数字的和是?
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在小于100的正整数中共有多少个数能被3整除?这些数字的和是?
在小于100的正整数中共有多少个数能被3整除?这些数字的和是?
在小于100的正整数中共有多少个数能被3整除?这些数字的和是?
100÷3=33……1
也就是说,100以内的正整数中能被3整除的数共33个,它们的和：
S＝3+6+9+12+……+96+99
＝3×（1+2+3+……+32+33）
＝3×（1+33）×33÷2
＝3×17×33＝1683
Private Sub Form_Load()
Dim i As Integer
Dim n As Integer
Dim a() As Integer
Dim s As Integer
n = 0
For i = 1 To 100
If i Mod 3 = 0 Then
ReDim Preserve a(n)
...
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Private Sub Form_Load()
Dim i As Integer
Dim n As Integer
Dim a() As Integer
Dim s As Integer
n = 0
For i = 1 To 100
If i Mod 3 = 0 Then
ReDim Preserve a(n)
a(n) = i
n = n + 1
End If
Next i
Print "共有" & n & "个数字能被3整除："
For i = 0 To n - 1
Print a(i)
s = s + a(i)
Next i
Print "所有数字之和=" & s
End Sub
答案是1683
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一楼回答正确，
二楼的太有才了，
三楼我补充修正
Sub Load3()
Dim i As Integer
Dim n As Integer
Dim s As Integer
For i = 1 To 100
If i Mod 3 = 0 Then
s = s + i
n = n + 1
全部展开
一楼回答正确，
二楼的太有才了，
三楼我补充修正
Sub Load3()
Dim i As Integer
Dim n As Integer
Dim s As Integer
For i = 1 To 100
If i Mod 3 = 0 Then
s = s + i
n = n + 1
End If
Next i
MsgBox "共有" & n & "个数字能被3整除,他们的和是" & s
End Sub
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