What is zoned decimal in mainframe?
A zoned decimal is a USAGE DISPLAY item where every digit is represented using one byte character, the corresponding ASCII or EBCDIC character is used for each digit.
What is zoned decimal and packed decimal?
A zoned decimal value will have the positive / negative zone ONLY in the last byte of the value. Hence a zoned decimal value of X’F1F2F3D4′ is -1234. A packed decimal value uses the first four bits of each byte to hold a numeric digit, and the last four bits to hold another digit.
What is meant by packed decimal?
Packed-decimal format means that each byte of storage (except for the low order byte) can contain two decimal numbers. The low-order byte contains one digit in the leftmost portion and the sign (positive or negative) in the rightmost portion.
What is decimal value in COBOL?
Decimal point position can be used with numeric data. Assumed position is the position of decimal point and not included in the data. Length defines the number of bytes used by the data item.
What is packed decimal in COBOL?
(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.
Why do we have packed decimal format how does it differ from a zoned decimal format?
Zone decimal uses an entire byte for each digit. This means you can just print a number as if it was text (each ‘character’ stores a digit 0-9) but since there are only 10 digits and a byte can hold 256 different values this is a bit wasteful. Packed decimal uses the fact that 4bits can store 16different values.
What is the difference between Comp and Comp 3?
COMP usage stores the data in half word or in full word, depending on the size of the data. COMP3 usage stores 1 digit in half byte (i.e. 4 bits) and a separate 1 bit is reserved for the sign, which is stored at the right side of the data.
How many bytes is a packed decimal?
A packed decimal representation stores two decimal digits in one byte. A packed decimal representation stores decimal digits in each “nibble” of a byte (a byte is eight bits and a nibble is four bits).
Which one is better comp or COMP3?
We can use 9, S and V in PIC clause during data declaration. V is used to store decimal point at a particular location in data item….Difference between COMP and COMP3.
| COMP | COMP3 |
|---|---|
| We can use only 9 and S in PIC Clause. | We can use 9 , S , V in PIC Clause. |