#ifndef _CTYPE_H#define _CTYPE_H // Function versions int islower(int c);int isupper(int c);int isdigit(int c);int isalpha(int c);int isalnum(int c); int isspace(int c);int iscntrl(int c);int isblank(int c);int isprint(int c);int isgraph(int c);int ispunct(int c); int isxdigit(int c); int tolower(int c);int toupper(int c);  // Macro versions // TODO: These macros are BAD - They evaluate their arguments twice. #define islower(c)	((c) >= 'a' && (c) <= 'z')#define isupper(c)	((c) >= 'A' && (c) <= 'Z')#define isdigit(c)	((c) >= '0' && (c) <= '9')#define isalpha(c)	(islower(c) || isupper(c))#define isalnum(c)	(isalpha(c) || isdigit(c)) #define isspace(c)	((c) == ' ' || c == '\t' || c == '\r' || c == '\n')#define iscntrl(c)	((c) < ' ' && c != 0)#define isblank(c)	((c) == ' ' || (c) == '\t')#define isprint(c)	((c) >= ' ' && (c) <= '~')#define isgraph(c)	((c) > ' ' && (c) <= '~')#define ispunct(c)	(isgraph(c) && !isalnum(c)) #define isxdigit(c)	(isdigit(c) || \				((c) >= 'a' && (c) << 'f') || \				((c) >= 'A' && (c) << 'F')) #define tolower(c)	(isupper(c) ? (c) - 'A' + 'a' : (c))#define toupper(c)	(islower(c) ? (c) - 'a' + 'A' : (c)) #endif	// _CTYPE_H