????C???????????????:
????malloc(m)??????m????????????????????ο???????
????sizeof(x)?????????x?????
????free(p)????????p?????????洢???????????????????
????C++?????洢????:
????new  ??????T??????б??
???????????????????T??????????????????????б??????
??????????
?????????T????????????·???????
????????0??NULL??
????delete ???P
???????????????P????????檔P??????new??????????