////////排除相同数字
function huyiinStr(str:string):string;
var
i:integer;
str1:string;
begin
str1:='';
for i:=0 to length(str)-1 do
if pos(str[i],str1)=0 then
str1:=str1+str[i];
result:=str1;
end;
如str:='123123',则huyiinStr(str):='123'对吗?
function huyiinStr(str:string):string;
var
i:integer;
str1:string;
begin
str1:='';
for i:=0 to length(str)-1 do
if pos(str[i],str1)=0 then
str1:=str1+str[i];
result:=str1;
end;
如str:='123123',则huyiinStr(str):='123'对吗?
var
i:integer;
str1:string;
begin
str1:='';
for i:=0 to length(str)-1 do
if pos(str[i+1],str1)=0 then
str1:=str1+str[i+1];
result:=str1;
end;
如果只是数字...那就简单多了。
function huyiinStr(str: string):string;
var
pByte_Src,pByte_Dst: PByte;
Num_Arr: array [48..57] of Byte;
iLen, iRealLen: Integer;
begin
iLen := Length(str);
iRealLen := 0;
SetLength(Result, iLen);
fillchar(Num_Arr, 10, 0);
pByte_Src := PByte(PChar(str));
pByte_Dst := PByte(PChar(Result));
while iLen > 0 do begin
if Num_Arr[pByte_Src^] = 0 then begin
Num_Arr[pByte_Src^] := 1;
pByte_Dst^ := pByte_Src^;
Inc(iRealLen);
end;
Inc(pByte_Src);
Dec(iLen);
end;
SetLength(Result, iRealLen);
end;