请问一个问题！！

[DelphiBird]

如何判断一个字符串中是9个数字？？

[taidy]

9个数字

var t: char;

if length(astring) = 9
begin
for i:= 1 to length(astring)
t:= pos(astring,i,1)
if not isnumberic(t) then
begin
showmessage('Error')
break;
end

end;

[1nbud]

function IsNumber9(s:string);
begin
Result:=Length(s)=9;
if Result then
for i:=1 to 9 do
if not(s[i] in ['0'..'9']) then Result:=false;
end;

[taidy]

有些错误更正
var
i:integer;
t,astring : string;// to be test;
begin


if length(astring) = 9 then
begin
for i:= 1 to length(astring) do
begin
t:= copy(astring,i,1);
if pos(t,'0123456789')=0 then
begin
showmessage('Error');
break;
end;
end;
end;
end;

[DelphiBird]

写错了吧

[procedure007]

function IsNumber(s:string);Boolean;
begin
Result:=Length(s)=9;
if Result then
for i:=low(S) to hi(s) do
if not(s[i] in ['0'..'9']) then Result:=false;
end;