HLASM Language Reference

DC Instruction
Notes:
1. Don't confuse the exponent modifier with the exponent that can be specified in
the nominal value subfield of fixed-point and floating-point constants.
The exponent modifier affects each nominal value specified in the operand,
whereas the exponent written as part of the nominal value subfield only affects
the nominal value it follows. If both types of exponent are specified in a DC
operand, their values are added together before the nominal value is converted
to binary form. However, this sum must lie within the permissible range of −85
to +75, unless a type extension is specified.
2. The value of the constant, after any exponents have been applied, must be
contained in the implicitly or explicitly specified length of the constant to be
assembled.
Subfield 6: Nominal Value
The syntax for coding the nominal value is shown in the subfield format on page
127.
You must specify the nominal value subfield unless a duplication value of zero is
specified. It defines the value of the constant (or constants) described and affected
by the subfields that precede it. It is this value that is assembled into the internal
binary representation of the constant. Figure 37 shows the formats for specifying
constants.
Figure 37. Specifying Constant Values
Constant
Type
Single
Nominal Value
Multiple
Nominal Value
C 'value' not allowed 142
G '' not allowed 145
B
X
H
F
P
Z
E
D
L
A
Y
S
V
R
Page No.
'value' 'value,value,...value' 141
147
148
148
151
151
161, 167
161, 167
161, 167
(value) (value,value,...value) 153
153
153
153
153
Q (value) (value,value,...value) 159
J (value) (value,value,...value) 160
As the above list shows:
A data constant value (any type except A, Y, S, Q, J, R and V) is enclosed by
single quotation marks.
An address constant value (type A, Y, S, V, R) or an offset constant (type Q) or
a length constant (type J) is enclosed by parentheses.
140 HLASM V1R5 Language Reference