Delphi 子界类型定义

//整数，字符（ASCII码），有序类型

Const

　　x = 7;

　　y = 20;

　　a = -3;

type

　　TColors = ( red, green, blue, yellow); 

     num = x - a .. y;

　　ten = -5..10;

　　hundred = 100 -x .. 1000 -y;

　　UpperCase = 'A'..'F';

　　LowerCase = 'a' .. 'z';

　　colors = green..yellow;

子界

//定义
type
  Ten = 1..10;
  OverHundred = 100..1000;
  Uppercase = 'A'..'Z';
  //TMonth = Jan..Dec;

---

//应用
var
  UppLetter: UpperCase;
begin
  UppLetter := 'F';

---

//判断是否属于子界范围
var
  i: Integer;
begin
  i := 1;
  if i in [0..10] then
    ShowMessage('i 大于0、小于10');
end;

---

//根据枚举定义子界
type
  TColors = (Red,Blue,Green,Yellow,Orange,Purple,White,Black);
  TMyColors = Blue..Yellow;
var
  MyColor: TMyColors;
begin
  MyColor := Blue;
  ShowMessage(IntToStr(Ord(MyColor)));  //1
end;

---

//遍历子界
var
  character: 'a' .. 'z';
  s: string;
begin
  for character in [Low(character) .. High(character)] do
  begin
    s := s + character;
  end;
  ShowMessage(s);  //abcdefghijklmnopqrstuvwxyz
end;

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子界

//定义
type
  Ten = 1..10;
  OverHundred = 100..1000;
  Uppercase = 'A'..'Z';
  //TMonth = Jan..Dec;

---

//应用
var
  UppLetter: UpperCase;
begin
  UppLetter := 'F';

---

//判断是否属于子界范围
var
  i: Integer;
begin
  i := 1;
  if i in [0..10] then
    ShowMessage('i 大于0、小于10');
end;

---

//根据枚举定义子界
type
  TColors = (Red,Blue,Green,Yellow,Orange,Purple,White,Black);
  TMyColors = Blue..Yellow;
var
  MyColor: TMyColors;
begin
  MyColor := Blue;
  ShowMessage(IntToStr(Ord(MyColor)));  //1
end;

---

//遍历子界
var
  character: 'a' .. 'z';
  s: string;
begin
  for character in [Low(character) .. High(character)] do
  begin
    s := s + character;
  end;
  ShowMessage(s);  //abcdefghijklmnopqrstuvwxyz
end;