Z. suppresses leading zeros. . inserts an actual decimal point in the number.
COMP-3 data stored in memory higher to lower in the size of nibble (4 bits). i.e. The upper nibble stores the most significant digit and lower nibble stores the next digit and the upper nibble stores the next digit etc.
88 level number in COBOL is one of the most used declarations in mainframes development and it is considered as a special level number which is used to improve the readability of COBOL programs. As it gives a name to a condition, it is also called as 'Condition Names'.
The internal format for a PIC S9(03) COMP-3 variable with a value of +059 is X'059C' -- note that this is only two bytes, but that's the way COMP-3 variables are stored. There is absolutely no way you can use a REDEFINE into a USAGE DISPLAY variable that will allow this value to be processed as a numeric value.
PIC 9 for numbers, optionally with S (sign) or V (implicit decimal point). For example, PIC S9(7)V99 means a signed number with 7 digits to the left of the implicit decimal point and 2 digits to the right.
COBOL INSPECT. INSPECT INSPECT verb allows to count and/or replace a character or a group of characters. INSPECT has options TALLYING, REPLACING & CONVERTING. INSPECT Е with TALLYING option This form counts/tally a character or a group of characters in source string.
Why occurs clause cannot be declared at 01 level? according to the manual, a table is defined within a group item with an occurs clause. if the occurs clause were to be declared at the 01 level, there would be no group item, thus no beginning of table resolution.
The best choice is Packed-Decimal (COMP-3) and a Sign (S9). Regarding space Packed-Decimal is more effective, as the data is stored as decimal data, one decimal digit in one half byte, as Binary uses one byte oer digit.
You cannot move a COMP-3 variable to alphanumeric directly. It will not give a SOC7 error but will you give you a return code 12 stating that comp-3 and alphanumeric variables did not follow the move compatibility rule. 01 A1 PIC S9(4) COMP-3 VALUE 1234.
In case the COMP-3 Data, that you want to see is the data in a Mainframe File, and you would like to see the contents on TSO/ISPF, you can turn the HEX ON on the Command Line. In the below file, the last 2 Bytes are COMP-3 Data. You read the Hexa-decimal value in a top-down fashion. 3.
The sign is stored separately as the rightmost half-a-byte regardless of whether S is specified in the PIC or not. Data item is stored in packed decimal format. Each digit occupies half a byte (1 nibble) and the sign is stored at the rightmost nibble.
In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each digit is represented by a fixed number of bits, usually four or eight. Sometimes, special bit patterns are used for a sign or other indications (e.g. error or overflow).
Below are the
differences in
between the
index and
subscript.
Summary -
| Subscript | Index |
|---|
| Subscript can increase by using ADD statement and decrease by using SUBTRACT statement. | Index can increase by using SET UP BY statement and decrease by using SET DOWN BY statement. |
How is sign stored in a comp-3 field in COBOL? It is stored in the last nibble. For example if your number is +100, it stores hex 0C in the last byte, hex 1C if your number is 101, hex 2C if your number is 102, hex 1D if the number is -101, hex 2D if the number is -102 etc
COBOL has what you might call "decimal-binary" fields (COMP and siblings). That is, the data is stored as binary but its maximum and minimum values are the number and full value of the PICture clause which is used in the definition. COMP PIC 9 - can contain zero to nine. COMP PIC S99 - (signed) can contain -99 to +99.
A Condition Name set to true when one of the condition values mentioned in its VALUE clause is moved into its associated data-item. But you can also set a Condition Name to true using the SET verb.
In COMP usage Data is stored as Pure Binary format internally. Depending on the size of the data item, it can be stored either in a half-word (2 bytes with range 32,768 to +32767) or full- word (4 bytes with range 2,147,483,648 to 2,147,483,647).
We can't display COMP-3 directly so we have to move the value into another variable, check this given example. 01 A1 PIC S9(4) COMP-3 VALUE 1234. 01 A1-NUM PIC S9(4) VALUE ZEROES.
COMPUTATIONAL-5 or COMP-5 (native binary)
| Picture | Storage representation |
|---|
| S9(1) through S9(4) | Binary halfword (2 bytes) |
| S9(5) through S9(9) | Binary fullword (4 bytes) |
| S9(10) through S9(18) | Binary doubleword (8 bytes) |
| 9(1) through 9(4) | Binary halfword (2 bytes) |
Packed Decimal DataA packed decimal representation stores decimal digits in each "nibble" of a byte. Each byte has two nibbles, and each nibble is indicated by a hexadecimal digit. For example, the value 15 is stored in two nibbles, using the hexadecimal digits 1 and 5.
S9(7) COMP-3 will take 4 bytes of storage This is the preferred way as it is clear to anyone what was intended.
How many bytes does Comp 3 occupy? COMP-3 in IBM COBOL packs a digit in half a byte and uses another half byte to put the sign of the number. COMP-3, being Binary Coded Decimal, takes 1/2 byte per digit. So take the picture size, divide by two, and round up.
S0C7 abend is a Data exception which is caused when a usage computational-3 field has an invalid data (which is not 0-9). It may also be caused if the last byte contains an invalid sign bit (which is anything other than f, c, or d)
What is the length of PIC 9.999? Length of PIC 9.999 is 5 as '.
This document will focus on a discussion of a numeric field (or data string) known as "PACKED-DECIMAL" format (also referred to as packed data or a packed numeric field). A packed decimal representation stores decimal digits in each "nibble" of a byte (a byte is eight bits and a nibble is four bits).
(also called "Computational-3", "Packed Decimal", or "Packed") (See note 1 about terminology) COBOL Comp-3 is a binary field type that puts ("packs") two digits into each byte, using a notation called Binary Coded Decimal, or BCD. This halves the storage requirements compared to a character, or COBOL "display", field.
