HLASM Language Reference

DC Instruction—Binary Constant
To specify two or more values in the subfield, the values must be separated by
commas, and the whole sequence of values must be enclosed by the correct
delimiters; that is, single quotation marks or parentheses.
Multiple values are not permitted for character constants.
Spaces are allowed and ignored in nominal values for the quoted constant types
(BDEFHLPXZ). Spaces are significant for C and G constant types.
How nominal values are specified and interpreted by the assembler is explained in
each of the subsections that follow. There is a subsection for each of the following
types of constant:
Binary
Character
Graphic
Hexadecimal
Fixed-Point
Decimal
Packed Decimal
Zoned Decimal
Address
Floating-Point
Literal constants are described on page 171.
Binary Constant—B
The binary constant specifies the precise bit pattern assembled into storage. Each
binary constant is assembled into the integral number of bytes (see ▌1▐ in
Figure 38) required to contain the bits specified, unless a bit-length modifier is
specified.
The following example shows the coding used to designate a binary constant. BCON
has a length attribute of 1.
BCON DC B'111111'
BTRUNC DC BL1'1111'
BPAD DC BL1'11'
BFOUR DC B'1111 1 1111 1'
BTRUNC assembles with the leftmost bit truncated, as follows:
111
BPAD assembles with five zeros as padding, as follows:
11
Figure 38 (Page 1 of 2). Binary Constants
Subfield Value Example Result
1. Duplication factor Allowed
2. Type B
3. Type Extension Not Allowed
| 4. Program type Allowed
Chapter 5. Assembler Instruction Statements 141