某Visual Basic程序如下: Private Sub Command1_Click() Dim a as single, b as single, c as single A=1 B=5 C=sqr(a-b) Text1.text=str( c ) End sub
运行程序,单击命令按钮Command1后弹出如图2-1-23所示的出错信息提示,此时程序正执行的语句是( )
a=1
b=5
c=sqr(a-b)
Text1.text=str(c)