单项选择题

单击一次窗体之后,下列程序代码的执行结果为______ 。 Private Sub Command1_ Click() Dim a As Integer, b As Integer, c As Integer a = 1: b = 2: c = 4 Print Value(a, b, c) End Sub Function Num(x As Integer, y As Integer, z As Integer) Num = x * x + y * y + z * z End Function Function Value(x As Integer, y As Integer, z As Integer) Value = Num(x, y, z) + 2 * x End Function

A.21
B.23
C.19
D.35