#include"iostream.h"
只要达到目的,不一定一定用time吧
http://hi.baidu.com/techbobo/blog/item/b27292080fe1d2920b7b8207.html
http://beyondjhf-2008.iteye.com/blog/400025
不错的http://www.bysj999.com/html/VC_C__biyesheji/20090203/1813.html
http://topic.csdn.net/t/20030909/03/2238401.html