//#include "/usr/include/assert.h"
//#include "/usr/include/ctype.h"
#define __P(arg) arg
#define __exctype(name) extern int name __P ((int))
#define	__isctype(c,type)	(__ctype_b[c] & (unsigned short int) type)
#define	isalpha(c)	__isctype((c), _ISalpha)
//__isctype(c,_ISalpha)
isalpha(x)
assert (a<b);