Dim n%, m%, TS%, JS%
5:
n = InputBox("請輸入總的個數:")
If n = 0 Then GoTo 5
10:
m = InputBox("請輸入總的腳數:")
If m = 0 Or m Mod 2 <> 0 Or m < 2 * n Then
MsgBox "輸入腳數不合理,請重新輸入:", vbOKOnly + 64
GoTo 10
End If
TS = (m - 2 * n) / 2
JS = (4 * n - m) / 2
If TS < 0 Or JS < 0 Or TS + JS <> n Or 4 * TS + 2 * JS <> m Then GoTo 10
MsgBox "雞有:" & JS & "只" & Chr(13) & "兔有:" & TS & "只"
End Sub