Had electronic computers not been invented, many problems of space flight____now.

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• 在窗体上画—个命令按钮，其名称为Command1，然后编写如下事件过程： Private Sub Command1_Click（) a$="National Computer Rank Examination" n=Len（a$) s=0 For i=1 To n b$=Mid（a$,i,1) Ifb$="n" Then s=s+1 End If Next i Print S End Sub 程序

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• 在窗体上画一个命令按钮，其名称为Command1，然后编写如下事件过程： Private Sub Command1_Click（) aS="National Computer Rank Examination" n=Len（a$) s=0 For i=1 To nb$=Mid（as,i,1)If b$="n"Then s=s+1End If Next i Print S End Sub 程序运行后

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