单项选择题

单击命令按钮时,下列程序的运行结果为 Private Sub Command1_Click()  Print Fun(23,18) End Sub Public Function Fun(m As Integer,n As Integer)As Integer  Do While m<>n    Do While m>n:m=m-n:Loop    Do While m<n:n=n-m:Loop Loop Fun=m End Function

A.0
B.1
C.3
D.5