for i:=1 to len(edit4.text) begin aa:=copy(edit4.text,i,1) if aa>'z' or aa<'a' then showmessage('error'); end;
if not (trim(edit4.Text)[1] in ['a'..'z']) then showmessage('error');
for i:=1 to len(edit4.text) begin aa:=copy(edit4.text,i,1) if aa>'z' or aa<'a' then begin showmessage('error'); exit; end; end;
类型都不对。 ['a'..'z']是字符集合 edit.text是字符串for i:= 1 to Length(Edit4.Text) do begin if not(Edit4.Text[i] in ['a'..'z']) then begin ShowMessage('Error'); Break; end; end;
begin
aa:=copy(edit4.text,i,1)
if aa>'z' or aa<'a' then
showmessage('error');
end;
showmessage('error');
begin
aa:=copy(edit4.text,i,1)
if aa>'z' or aa<'a' then
begin
showmessage('error');
exit;
end;
end;
['a'..'z']是字符集合
edit.text是字符串for i:= 1 to Length(Edit4.Text) do begin
if not(Edit4.Text[i] in ['a'..'z']) then begin
ShowMessage('Error');
Break;
end;
end;