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When numeric data is moved or stored into a COMP-5 item, truncation occurs at the binary field size rather than at the COBOL picture size limit. When a COMP-5 item is referenced, the full binary field size is used in the operation.
- Computational items
A computational item is a value used in arithmetic...
- BINARY (COMP or COMP-4)
BINARY data and synonyms COMP and COMP-4 are the two's...
- Computational items
23 lut 2017 · COMP, COMP-4 and BINARY are in fact synonyms of each other in the compiler (more accurately, COMP-4 and BINARY are synonyms of COMP). COMP-5, also known as "native binary", is different. COBOL has what you might call "decimal-binary" fields (COMP and siblings).
A computational item is a value used in arithmetic operations. It must be numeric. If a group item is described with a computational usage, the elementary items within the group have that usage. The maximum length of a computational item is 18 decimal digits, except for a PACKED-DECIMAL item.
14 kwi 2015 · COMP-5 does truncation to field-size, binary truncation. Compiler option TRUNC with (BIN) will treat all binary fields (COMP, COMP-4, BINARY) as "native binary" (COMP-5). Generally more instructions are generated for COMP-5 than for the others.
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).
COMPUTATIONAL or COMP Representation of the COMPUTATIONAL phrase is system-dependent and is normally assigned to representations that yield the greatest efficiency when arithmetic operations are performed on that system. For the VS COBOL II compiler, the COMPUTATIONAL phrase is synonymous with BINARY. COMPUTATIONAL-1 or COMP-1
12 lip 2007 · COMPUTATIONAL-5 or COMP-5 (native binary): These data items are represented in storage as binary data. The data items can contain values up to the capacity of the native binary representation (2, 4 or 8 bytes), rather than being limited to the value implied by the number of nines in the picture for the item (as is the case for USAGE BINARY data).
