What is Comp-3 variable in mainframe?

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.

Why do we use comp-3 in COBOL?

Usage clause is applicable only on numerical data items. It stores the data in packed decimal form. It uses one rightmost bit to store the sign irrespective of weather we have used S in PIC clause or not.

What is Comp value in COBOL?

The RM/COBOL system represents COMP (or COMPUTATIONAL) data in packed decimal format with one character per byte stored in each least significant four bits. If the data item is signed, the sign byte has the most significant half-byte set to hexadecimal value 2.

What is the difference between COMP 1 and COMP 2?

COMP-1 refers to short (single-precision) floating-point format, and COMP-2 refers to long (double-precision) floating-point format, which occupy 4 and 8 bytes of storage, respectively. The leftmost bit contains the sign; the next seven bits contain the exponent; the remaining 3 or 7 bytes contain the mantissa.

Can COBOL display Comp variable 3?

In the below file, the last 2 Bytes are COMP-3 Data. You read the Hexa-decimal value in a top-down fashion. 3. You may also DISPLAY this in COBOL, by first MOVE’ing the data to a Numeric-Edited DISPLAY Format Variable.

What is Comp 4 COBOL?

comp-4 is fixed-point binary data with 15-bit precision, word-aligned, and stored in two bytes. The scaling factor is zero. Values are stored in two’s complement form. For integer data, such as counters and switches that do not require values outside the range -32,768 to +32,767, use comp-4 data.

What is the difference between Comp and Comp-3?

Comp is a binary usage, while comp-3 indicates packed decimal. The other common usages are binary and display. IBM Mainframes are typically binary and AS400’s are packed. ‘

What is comp in mainframe?

COMP usage is a binary representation of data and stores in pure binary format. The amount of storage occupied by a binary item depends on the number of decimal digits defined in its PICTURE clause.

What is Comp and Comp-3?

How is Comp-3 stored?

COMP-3 is the equivalent of PACKED-DECIMAL. COMP-3 can have a value not exceeding 18 decimal digits. 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.

How do you move Comp three variables to alphanumeric in COBOL?

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.

How is comp variable stored in COBOL?

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.

What is the difference between comp-3 and comp-3?

COMP-3 will store the data as packed. i.e. two digits in each byte. COMP-3 data will be stored in memory as BCD (Binary Coded Decimal) Format. COMP-3 data stored in memory higher to lower in the size of nibble (4 bits). i.e.

What is the difference between comp-2 and COMPUTATIONAL-3 and compup-4?

COMP-2 items are 8 bytes long. COMPUTATIONAL-3 or COMP-3 (internal decimal) This is the equivalent of PACKED-DECIMAL. COMPUTATIONAL-4 or COMP-4 (binary) This is the equivalent of BINARY. COMPUTATIONAL-5 or COMP-5 (native binary) These data items are represented in storage as binary data.

What is the difference between comp4 and comp3 in MS Access?

Point 4) COMP is used for Binary Representation it allows only S and 9. Comp-3 is used for Packed Decimal values it allows S 9 V mostly it is useful for Decimal Calculation Values. 5)COMP stores the data in the binary format and COMP-3 stores the date in the BCD (Binary Coded Decimal)format. .

What are the different types of comps?

COMP COMP-1 COMP-2 COMP-3 COMP:Normally, a computer can store data in more than one internal form. In COBOL, a programmer is allowed to specify the internal form of the data item so as to facilitate its use in the most efficient manner.