Private Sub Form_Click()
Dim Score As Single, Sum As Single, N As Integer, Average As Single
Sum = 0
N = 0
Score = InputBox("请输入第" & N + 1 & "个同学的成绩", "成绩输入")
Do While Score <> -1
Sum = Sum + Score
N = N + 1
Score = InputBox("请输入第" & N + 1 & "个同学的成绩", "成绩输入")
Loop
Average = Sum / N
Print "平均成绩为:"; Average
End Sub
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