HLASM: V1R6 Language Ref

DC instruction—Binary constantBinary constant—BThe binary constant specifies the precise bit pattern assembled into storage. Eachbinary constant is assembled into the integral number of bytes (see ▌1▐ in Table 22)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. BCONhas 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:00100011BPAD assembles with five zeros as padding, as follows:00000101Table 22. Binary constantsSubfield Value Example Result1. Duplication factor Allowed2. Type B3. Type Extension Not Allowed4. Program type Allowed5. ModifiersImplicit length:(length modifiernot present)Alignment:As needed B DC B’10101111’C DC B’101’ByteRange for length: 1 to 256(byte length).1 to .2048(bit length)Range for scale: Not allowedRange for exponent: Not allowed6. Nominal valueRepresented by: Binary digits(0 or 1)Enclosed by: Single quotationmarksExponent allowed: NoNumber of valuesper operand:MultiplePadding: With zeros at leftTruncation ofassembled value:At leftL'B = 1 ▌1▐L'C = 1 ▌1▐Character constant—CThe character constant specifies character strings, such as error messages,identifiers, or other text, that the assembler converts into binary representations. If140 HLASM: V1R6 Language Ref