ftypes

unix v7是最后一个广泛发布的研究型UNIX版本

/* variable types
 * numeric assumptions:
 *	int < reals < complexes
 *	TYDREAL-TYREAL = TYDCOMPLEX-TYCOMPLEX
 */

#define TYUNKNOWN 0
#define TYADDR 1
#define TYSHORT 2
#define TYLONG 3
#define TYREAL 4
#define TYDREAL 5
#define TYCOMPLEX 6
#define TYDCOMPLEX 7
#define TYLOGICAL 8
#define TYCHAR 9
#define TYSUBR 10
#define TYERROR 11

#define NTYPES (TYERROR+1)