其他分享
首页 > 其他分享> > Delphi 转换大小写字符(UpperCase、LowerCase)

Delphi 转换大小写字符(UpperCase、LowerCase)

作者:互联网

Delphi 转换大小写字符(UpperCase、LowerCase)

1、UpperCase //转换成大写

function UpperCase(const S: string): string;
var
  Ch: Char;
  L: Integer;
  Source, Dest: PChar;
begin
  L := Length(S);
  SetLength(Result, L);
  Source := Pointer(S);
  Dest := Pointer(Result);
  while L <> 0 do
  begin
    Ch := Source^;
    if (Ch >= 'a') and (Ch <= 'z') then Dec(Ch, 32);
    Dest^ := Ch;
    Inc(Source);
    Inc(Dest);
    Dec(L);
  end;
end;

  

2、LowerCase //转换成小写

function LowerCase(const S: string): string;
var
  Ch: Char;
  L: Integer;
  Source, Dest: PChar;
begin
  L := Length(S);
  SetLength(Result, L);
  Source := Pointer(S);
  Dest := Pointer(Result);
  while L <> 0 do
  begin
    Ch := Source^;
    if (Ch >= 'A') and (Ch <= 'Z') then Inc(Ch, 32);
    Dest^ := Ch;
    Inc(Source);
    Inc(Dest);
    Dec(L);
  end;
end;

  

 

创建时间:2021.02.03  更新时间:

标签:LowerCase,Ch,Dest,UpperCase,Delphi,begin,Source
来源: https://www.cnblogs.com/guorongtao/p/14366623.html