delphi - 如何使用“case”语句而不是“if”语句来测试值是否在范围内？

Question

下面的 if 语句可以转换为 case 语句吗？

if (Number >= 5) and (Number <= 10) then
  lblAnswer.Caption := 'in range'
else
  lblAnswer.Caption := 'out of range';

---

我的答案 ：

是的，它可以

case (number >= 5) and (Number <= 10) of
  lblAnswer.Caption := 'in range';
  lblAnswer.Caption := 'out of range';
end;

这个对吗？

Answer 1

如果 Number 具有某种整数数据类型，则：

case number of
5 .. 10: lblAnswer.Caption := 'in range';
else     lblAnswer.Caption := 'out of range';
end;

Answer 2

一个小修正：

case (number >= 5) and (Number <= 10) of
  true:lblAnswer.Caption := 'in range';
  false:lblAnswer.Caption := 'out of range';
end;

Answer 3

Function InRange (Lo,Hi,Val : Integer) : Boolean;
Begin
 Result := (Val>=Lo)And(Val<=Hi);
End;