Index_O

O

O (operand descriptor) operation extender, 193

object-oriented programming, structured programming and, 427

OCCUR, 187, 197, 314–316, 535

%OCCUR, 159

occurrence indexes, 314

OCCURS keyword, 64, 314

%OCCURS, 123

*OFF figurative constant, 25

*OFL, 31, 264

OFLIND keyword, 19, 49

OMIT, 419–420, 504–505

*OMIT, 25, 482, 483

*ON figurative constant, 25

ON-ERROR, 187, 317–318

MONITOR and, 293–294

natural expression support in, 200

syntax diagram for, 197

opcode (See also operation code), 3

OPDESC keyword, 64, 482, 489–490, 588–589

OPEN, 187, 319–320, 496, 512, 519–520

ACQ and, 319

CLOSE and, 319

cursor positioning after successful operation of, 509

syntax diagram for, 197

USROPN keyword and, 519

workstation device file processing and, 518

Open Query File (OPNQRYF), 22

%OPEN, 123, 160

OPENOPT Control specification keyword, 42

operands, 104–106

operation codes (opcode), 3, 181–391

arguments in, 29–30

Boolean operators and, 200, 213, 225, 253, 255, 282, 320, 382, 436, 444

branching and, 411

CALL routines and, 410

case sensitivity in, 194

COMP and, 418–419

compare and branch operations in, 417–418

converting code to modern RPG programming practices, 423

cursor positioning after successful operation of, 509

date and time (DTS) format codes for, 189–191

date and time duration codes in, 191–192

DO loops and, 414–416

error status codes and, 202

extender reference for, 192–193

file processing and, 496

file status error codes and, 204–206

free-format, 200–201

hierarchical subprocedures in, 423

indicatorless controlled logic in, 413–414

indicators deprecated for, 409–412, 420–421

math operations and, 421, 422

modern usage of, 407–423

natural expressions and, 200, 202

nested code in, 206–207

optimization of, 409–411

program status codes and, 202–203

ranges, lists, and SELECT/OMIT in, 419–420

RPG IV style tips in, 420–423

special device file, 328

structured programming and, 420, 421, 425–445

subprocedures and subroutines in, 421, 422–423

subscript fields and, 410

syntax diagrams for, 195–199

top-down logic in, 421

unconditional, 189

values in, optional, 194

variables in, 194

operators, 104–106, 436

OPTIMIZE (Optimization Level) compiler option, 550

optimizing code, 409–411, 550

OPTION, 42, 64–65, 482, 483, 547–549

OR operator, 104

ORxx, 187, 189, 320, 417, 438

DOUxx and, 254, 320

DOWxx and, 256–257, 320

fixed format conditional syntax in, 200

IFxx and, 282–284, 320

syntax diagram for, 197

WHENxx and, 320, 382

OS/400, xxii

OTHER, 187, 189, 321, 417

CASE and, 444

free-format calculation specifications and, 531

SELECT and, 353–354

syntax diagram for, 197

WHENxx and, 382–383

OUT, 29, 30, 187, 322

data areas and, 467, 469–471

DEFINE and, 243–245

syntax diagram for, 197

output, 10

OUTPUT (Compiler Output Listing) compiler option, 550

output control values, 30

output specifications, 4, 8, 9, 37, 79–88

externally described files and, 79, 86–88

program described files and, 80–85

overflow indicators, 16, 19

overflow, TRUNCNBR (Truncate Numbers on Overflow) in, 554

OVERLAY Definition specification keyword, 65