Why Comp Is Used In Cobol?

COMP in COBOL is to tell the compiler that numeric data is stored for calculation, by default, numeric data is stored for display. COMP-1 AND COMP-2 are for floating point numbers (not available when I was programming in the ’80s and’ 90s on IBM S/34, S/36, and AS/400). I used COMP-3 and COMP-4 format.

Why do we use comp?

Usage clause is applicable only on numerical data items. It represents the data purely in binary form. and can store the data either in half word or in full word depending on the size of the data.

Why do we use comp-3 in COBOL?

In COBOL, a programmer is allowed to specify the internal form of the records items that allows you to facilitate its use in the maximum efficient way. COMPUTATIONAL and DISPLAY are the two general forms of internal representation. It is used to store and compress the storage space.

What is comp data type in COBOL?

BINARY data and synonyms COMP and COMP-4 are the two’s complement data representation in COBOL. BINARY data is declared with a PICTURE clause as with internal or external decimal data but the underlying data representation is as a halfword (2 bytes), a fullword (4 bytes) or a doubleword (8 bytes).

Which is better comp or COMP3 in COBOL?

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.

What is soc4 Abend?

S0C4 Abend is a protection exception when a virtual address cannot be mapped with a physical address. When S0C4 Abend occurs. An Invalid address referenced due to subscript error. In a group Move the length of the receiving field was defined incorrectly.

What is comp data type?

COMP-1. A 4-byte, single precision, floating-point Real data type that specifies internal floating-point items. The sign is contained in the first bit of the leftmost byte, and the exponent is contained in the remaining seven bits of that byte. The remaining three bytes hold the mantissa.

How many bytes is a comp?

COMP-1 items are 4 bytes long. Specified for internal floating-point items (double precision). COMP-2 items are 8 bytes long. This is the equivalent of PACKED-DECIMAL.

Can Comp-3 be converted to numeric?

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. 01 A1-NUM PIC S9(4) VALUE ZEROES.

Can we display Comp-3 variables?

1. 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.

What is Comp-3 variables COBOL?

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.

What is 77 level used for in COBOL?

Entries that specify noncontiguous data items, which are not subdivisions of other items, and are not themselves subdivided, have been assigned the special level-number 77.

What is 66 level number in COBOL?

You must use the level number 66 for data description entries that contain the RENAMES clause. A level-66 entry cannot rename another level-66 entry, nor can it rename a level-01, level-77, or level-88 entry. One or more RENAMES entries can be written for a logical record.

Can I declare occurs in 01 level?

The table element definition (which includes the OCCURS clause) is subordinate to the group item that contains the table. The OCCURS clause cannot appear in a level-01 description.

What is the difference between Comp & Comp-3?

Comp is a binary usage, while comp-3 indicates packed decimal. The other common usages are binary and display.

Is Comp-3 packed decimal?

or PACKED-DECIMAL Format. This format, commonly called binary-coded decimal format, represents numeric data items in radix 10, but with each digit of the value held in only one half of one computer character, as described in the table below.

What is SB37 abend?

Abend SB37 indicates the data set has overflowed the space allocated. The “OUTPUT FILE FULL” message results when the DCB attributes (LRECL and BLKSIZE) are too small to process the data.

What is S322 abend?

On a mainframe, a job abends with an S322 abend code when the TIME value has been exceeded on a per job or per step basis.

What is S122 abend?

Code. Description. S122. The operator canceled the job and requested a dump.

What is PIC S9 in COBOL?

PIC X for strings. PIC X(100) means a 100-byte string. 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.

How is data stored for comp in COBOL?

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).