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 Table 1) 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'11011101'
BTRUNC   DC              BL1'100100011'
BPAD     DC              BL1'101'
BFOUR    DC              B'1111 0100 1111 0100'
BTRUNC assembles with the leftmost bit truncated, as follows: 
00100011
BPAD assembles with five zeros as padding, as follows: 
00000101
Table 1. Binary constants
Subfield Value Example Result
1. Duplication factor Allowed    
2. Type B    
3. Type Extension Not Allowed    
4. Program type Allowed    

5. Modifiers

      

   Length:

1 to 256
(byte length)
 
.1 to .2048
(bit length)

    

      Implicit length:
      (Length modifier
      not present)

As needed

 
B  DC  B'10101111'
C  DC  B'101'
 
L'B = 1  1 
L'C = 1  1 

      Alignment:

 Byte    

   Scale:

 Not allowed    

   Exponent:

 Not allowed    
6. Nominal value      

   Represented by:

Binary digits
(0 or 1)

    

   Enclosed by:

 Apostrophes    

   Exponent allowed:

 No    

      Number of values
      per operand:


Multiple

    

   Padding:

 With zeros at left    

      Truncation of
      assembled value:

At left

    
Parent topic: Subfield 6: Nominal Value