?? ctype.h
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#ifndef _CTYPE_H#define _CTYPE_H#define _U 0x01 /* upper */#define _L 0x02 /* lower */#define _D 0x04 /* digit */#define _C 0x08 /* cntrl */#define _P 0x10 /* punct */#define _S 0x20 /* white space (space/lf/tab) */#define _X 0x40 /* hex digit */#define _SP 0x80 /* hard space (0x20) */extern unsigned char _ctype[];extern char _ctmp;#define isalnum(c) ((_ctype+1)[c]&(_U|_L|_D))#define isalpha(c) ((_ctype+1)[c]&(_U|_L))#define iscntrl(c) ((_ctype+1)[c]&(_C))#define isdigit(c) ((_ctype+1)[c]&(_D))#define isgraph(c) ((_ctype+1)[c]&(_P|_U|_L|_D))#define islower(c) ((_ctype+1)[c]&(_L))#define isprint(c) ((_ctype+1)[c]&(_P|_U|_L|_D|_SP))#define ispunct(c) ((_ctype+1)[c]&(_P))#define isspace(c) ((_ctype+1)[c]&(_S))#define isupper(c) ((_ctype+1)[c]&(_U))#define isxdigit(c) ((_ctype+1)[c]&(_D|_X))#define isascii(c) (((unsigned) c)<=0x7f)#define toascii(c) (((unsigned) c)&0x7f)#define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp-('A'-'a'):_ctmp)#define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp-('a'-'A'):_ctmp)#endif?? 快捷鍵說明
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