delphi字符串简单问题

Question

var s:string;
begin
   showmessage(inttostr(sizeof(s)));
end;
结果是4，
怎么的出来的？
请教解答！！在线等=======谢谢各位!!

Answer 1

SizeOf,返回一个类型所占用的字节数
string类型占用4个字节

Answer 2

http://blog.csdn.net/zzz822163/archive/2008/11/14/3298285.aspx

Answer 3

var
  i:Integer;
  b:Byte;
  c:string;
  d:Double;
begin
  ShowMessage(IntToStr(SizeOf(i)));   //4
  ShowMessage(IntToStr(SizeOf(b)));   //1
  ShowMessage(IntToStr(SizeOf(c)));   //4
  ShowMessage(IntToStr(SizeOf(d)));   //8
end;