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delphi IsThisLeapYear 判断闰年
function IsThisLeapYear(year : Word): Boolean;
begin
Result := SysUtils.IsLeapYear(year);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
year : integer;
begin
year := StrToInt(Edit1.Text);
if (IsThisLeapYear(year)) then
ShowMessage(Edit1.Text + ' is a leap year.')
else
ShowMessage(Edit1.Text + ' is not a leap year.');
end;