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Answer Posted / sid
Hi Friends;
Here I want to contribute a few lines in this discussion,
those might helpful to understand it very clearly.
BINARY
Specified for binary data items. Such items have a decimal
equivalent
consisting of the decimal digits 0 through 9, plus a sign.
Negative numbers
are represented as the two's complement of the positive
number with the same absolute value. The amount of storage
occupied by a binary item depends on the number of decimal
digits defined in its PICTURE clause:
1 through 4 2 bytes (halfword)
5 through 9 4 bytes (fullword)
10 through 18 8 bytes (doubleword)
The operational sign for ?big-endian? binary data (such as
OS/390 and VM) is contained in the left most bit of the
binary data. The operational sign for ?little-endian? binary
data is contained in the left most bit of the right most
byte of the binary data.
PACKED-DECIMAL
Specified for internal decimal items. Such an item appears
in storage in
packed decimal format. There are 2 digits for each character
position, except for the trailing character position, which
is occupied by the low-order digit and the sign. Such an
item can contain any of the digits 0 through 9, plus a sign,
representing a value not exceeding 18 decimal digits.
The sign representation uses the same bit configuration as
the 4-bit sign
representation in zoned decimal fields.
Following is the range I found in a IBM COBOL Programming manual
Picture Storage representation Numeric values
S9(1) through S9(4) Binary half-word (2 bytes) -32768
through +32767
S9(5) through S9(9) Binary full-word (4 bytes)
-2,147,483,648 through
+2,147,483,647
S9(10) through S9(18) Binary double-word (8bytes)
-9,223,372,036,854,775,808 through +9.223,372,036,854,775,807
9(1) through 9(4) Binary half-word (2 bytes) 0 through 65535
9(5) through 9(9) Binary full-word (4 bytes) 0 through
4,294,967,295
9(10) through 9(18) Binary double-word (8bytes) 0 through
18,446,744,073,709,551,615
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