HLASM Language Reference

DC Instruction—Fixed-Point Constants
Figure 41 (Page 2 of 2). Hexadecimal Constants
Subfield Value Example Result
Range for length: 1 to 256
(byte length)
.1 to .2048
(bit length)
Range for scale:
Not allowed
Range for exponent:
Not allowed
6. Nominal value
Represented by:
Hexadecimal
digits
(0 to 9 and
A to F)
DC X'1F'
DC X'91F'
Object code
X'1F' ▌1▐
X'091F' ▌3▐
Enclosed by:
Single quotation
marks
Exponent allowed:
No
Number of values
per operand:
Multiple
Padding:
With zeros at left
Truncation of
assembled value:
At left
Fixed-Point Constants—F and H
Fixed-point constants let you introduce data that is in a form suitable for the
arithmetic operations of the binary fixed-point machine instructions. The constants
you define can also be automatically aligned to the correct doubleword, fullword or
halfword boundary for the instructions that refer to addresses on these boundaries
(unless the NOALIGN option has been specified; see “General Information About
Constants” on page 129). You can do algebraic operations using this type of
constant because they can have positive or negative values.
A fixed-point constant is written as a decimal number, which can be followed by a
decimal exponent. The format of the constant is as follows:
1. The nominal value can be a signed (see ▌1▐ in Figure 42 on page 149)
integer, fraction, or mixed number (see ▌2▐ Figure 42) followed by a signed
exponent (see ▌3▐ in Figure 42). If a sign is not specified for either the number
or exponent, + is assumed.
2. The exponent must lie within the permissible range (see ▌4▐ in Figure 42). If
an exponent modifier is also specified, the algebraic sum (see ▌5▐ in Figure 42)
of the exponent and the exponent modifier must lie within the permissible
range.
Some examples of the range of values that can be assembled into fixed-point
constants are given below:
148 HLASM V1R5 Language Reference