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Numeric items
testing (cont’d)
relation test, 2–3
sign test, 2–3
Numeric moves
elementary, 2–6
Numeric relational operators (tab.), 2–3
O
-O0 flag, 1–13
-O1 flag, 1–13
-O2 flag, 1–13
-O3 flag, 1–13
-O4 or -O flag, 1–13
/OBJECT, 1–34
in program development, 15–5
Object file
directory used, 1–17
file name suffix, 1–9
linker order of loading, 1–19
linking, 1–27
obtaining information about, 1–26
passing directly to ld (example), 1–10
renaming, 1–17
retaining, 1–16
used to create a shared library, 1–21
Object module
creating, 1–17, 1–29
default user libraries, 1–42
defining the search order for, 1–43
libraries
definition, 1–41
using system-supplied libraries, 1–42
using user-created libraries, 1–41
OCCURS clause
indexes, 4–1
keys, 4–1
OCCURS n TIMES clause
value of n
compiler implementation specifications,
A–3
odump command, 1–26
.o file suffix, 1–16
-o flag, 1–17
-O flag, 15–1
and debugging, 15–4
OMITTED argument-passing mechanism, 12–11
ON EXCEPTION, B–17
ON EXCEPTION phrase, 11–13
-o output flag, 1–13
OPEN and CLOSE statements, 6–25
Open mode
EXTEND, 6–25
INPUT, 6–25
I-O, 6–25
OUTPUT, 6–25
OpenVMS Alpha
Calling Standard, 13–2
Run-Time Library routines, 13–4
System Services routines, 13–4
Usages, 13–8
COBOL equivalents, 13–8
OpenVMS Alpha tuning, 1–3
Optimization, 15–1 to 15–25
confusing behavior in debugging, 15–4
DISPLAY, avoiding, 15–5
file design, 15–15
I/O operations, 15–10
APPLY clause, 15–10
DEFERRED-WRITE phrase, 15–11
EXTENSION phrase, 15–11
FILL-SIZE ON phrase, 15–12
PREALLOCATION phrase, 15–10
WINDOW phrase, 15–12
sharing record areas, 15–13
sharing record areas (fig.), 15–13
using multiple buffers, 15–12
image activation, 15–25
indexed files, 15–19
I/O, 15–20
alternate keys, 15–21
bucket size, 15–21
bucket size in bytes (tab.), 15–21
caching index roots, 15–25
calculating bucket size (tab.), 15–21
calculating index levels, 15–24
file size, 15–22
index depth, 15–22
records, 15–20
two-level primary index (fig.), 15–19
in relation to program structure, B–11
levels, 15–4
numeric data representation, 15–7
BINARY, 15–5, 15–7
COMP, 15–5, 15–7
COMP-3, 15–7
DISPLAY, 15–7
mixing data types, 15–7
PACKED-DECIMAL, 15–7
scaling, 15–7
PROCEDURE DIVISION
GO TO DEPENDING ON, 15–8
IF, 15–8
indexing, 15–9
SEARCH, 15–9
SEARCH ALL, 15–9
subscripting, 15–9
relative files, 15–16
bucket size, 15–17
one block (tab.), 15–18
three blocks (tab.), 15–17
cell size, 15–16
calculating formulas (tab.), 15–16
file size, 15–18
Index–18