Format of 1234 in COMP, COMP-1, COMP-2, COMP-3

priya · Posted: Mon Feb 16, 2004 7:41 pm

Can anybody explain the internal format of 1234 in COMP, COMP-1, COMP-2, COMP-3?

And the size of 1234 in all computational classes?

pradeep · Posted: Thu Feb 26, 2004 3:50 pm

Hello sir,

In general 1 byte = 8 bits.
4 bytes = 1 fullword
2 bytes = 1/2 word

DISPLAY Default. Number of bytes required equals to the size of the data item.
COMP Binary representation of data item.
PIC clause can contain S and 9 only.
S9(01) – S9(04) Half word.
S9(05) – S9(09) Full word.
S9(10) - S9(18) Double word.
Most significant bit is ON if the number is negative.

COMP-1 Single word floating point item. PIC Clause should not be specified.
COMP-2 Double word floating-point item. PIC Clause should not be specified.
COMP-3 Packed Decimal representation. Two digits are stored in each byte.
Last nibble is for sign. (F for unsigned positive, C for signed positive
and D for signed negative)
Formula for Bytes: Integer ((n/2) + 1)) => n is number of 9s.