以下程序的功能是:从键盘上输入若干个数字,当输入负数时结束输入,统计出若干数字的平均值,显示结果。请填空。Private Sub Form click()Dim x,y As SingleDim z As Integerx=Input Box (”Enter a score)Do while【 】y=y + x2=2+1x=Input Box (”Enter a score)Loopif