ÔÚ/DEFINE»ò/UNDEFINEÖ®ºó±ØÐëÖ¸¶¨Ìõ¼þÃû¡£
30
ÔÒò. . . . . : /DEFINEºÍ/UNDEFINEαָÁî±ØÐëºóËæÌõ¼þÃû¡£Ìõ ¼þÃûµÄµÚÒ»¸ö×Ö·û±ØÐëÊÇ×Öĸ(A-Z¡¢a-z¡¢@¡¢‚ºÍ#)¡£ºóÐø×Ö·û±ØÐëÊÇ×Öĸ¡¢Êý ×Ö£¨0-9£©»òÏ»®Ïß(_)×Ö·û¡£²»ÔÊÐíÃû³Æ"NOT"¡£Ãû³ÆµÄ×î´ó³¤¶ÈΪ50¡£
»Ö¸´. . . . . : È·±£Ö¸¶¨ÓÐЧÌõ¼þÃû¡£ÖØÐ±àÒë¡£