字符串操作\DM.dcu ..........\DM.ddp ..........\DM.dfm ..........\DM.pas ..........\DM.~dfm ..........\DM.~pas ..........\Project2.cfg ..........\Project2.dof ..........\Project2.dpr ..........\Project2.exe ..........\Project2.res ..........\Unit1.dcu ..........\Unit1.ddp ..........\Unit1.dfm ..........\Unit1.pas ..........\Unit1.~ddp ..........\Unit1.~dfm ..........\Unit1.~pas 字符串操作