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.

What is the difference between Comp and Comp-3 usage?

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 value 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. COMP PIC S99 – (signed) can contain -99 to +99.

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.

Which is faster COMP or COMP-3?

Comp-3 = Packed-Decimal is faster, because the z/Architecture, and also previous architectureres beginning with S/360, has built in instructions to directly manipulate Packed-Decimal data, e.g AP (Add packed).

What is usage comp in COBOL?

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.

How do you calculate Comp-3?

To calculate the byte-length of a comp-3 field, start with the total number of digits and divide by 2 giving a result (discarding the remainder if any), then add 1 to the result. So, a field with “pic s9(6) comp-3” would take 4 bytes (6/2 +1).

How do I get comp-3 values?

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.

How do you calculate bytes in Comp-3?

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.