D Dorland Unregistered / Unconfirmed GUEST, unregistred user! 2002-01-24 #2 记得好像有个叫强制转换的方法，可还是忘了。敬请告知！
L lujr Unregistered / Unconfirmed GUEST, unregistred user! 2002-01-24 #4 Trunc()： Truncates a real number to an integer.
T tqhuo Unregistered / Unconfirmed GUEST, unregistred user! 2002-01-24 #5 floattostr():可将实型转为字符型； Trunc()：可将实型转为整型;
