Private Sub Command1_Click()
For i = 101 To 200 Step 2
If isprime(i) Then s = s + i: n = n + 1
Next i
Print "100到200之间所有素数平均值="; s / n
End Sub
Function isprime(n) As Boolean
isprime = False
For i = 2 To Sqr(n)
If n Mod i = 0 Then Exit Function
Next i
isprime = True
End Function