function ggg(a1:string ;a2:integer):boolean;如果参数 a2 可有可无,应该怎么写呢???
调用时可以写:
procedure tform1.button1click(sender:tobject);
var
flag:boolean;
begin flag:=ggg('dddd');
或者是:
flag:=ggg('ddd',18);end;
调用时可以写:
procedure tform1.button1click(sender:tobject);
var
flag:boolean;
begin flag:=ggg('dddd');
或者是:
flag:=ggg('ddd',18);end;
function ggg(a1:string ):boolean; overload;
{...}