Machine Precision

Constants with names of the form VAL__EPS$<$T$>$ represent the machine precision when performing calculations using each data type. The machine precision $\epsilon$ is the smallest positive value such that ($1+\epsilon)$ can be represented on the machine and is distinguishable from 1 using the data type in question. The data types of these constants match the quantities they describe, as follows:

Constant	Type	Value	Hexadecimal Pattern
VAL__EPSUB	_UBYTE	1	01
VAL__EPSB	_BYTE	1	01
VAL__EPSUW	_UWORD	1	0001
VAL__EPSW	_WORD	1	0001
VAL__EPSI	_INTEGER	1	00000001
VAL__EPSR	_REAL	1.1920929E$-$7	00003500
VAL__EPSD	_DOUBLE	2.7755575615628914E$-$17	0000000000002500