Test268 Section 4
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Contents
- 1 Section 4 - Advanced RPG techniques (25%)
- 1.1 Given an example of a complex logical expression, determine its results
- 1.2 Given an example of deeply-nested logic within a sample of RPG code, determine the results of running the code
- 1.3 Use Data Structure arrays
- 1.4 Code complex D-specs (e.g., OVERLAY, coding fields without attributes, etc.)
- 1.5 Use modern techniques to handle numbered indicators
- 1.6 Determine appropriate use of system APIs
- 1.7 Code subprocedures
- 1.8 Declare and use subprocedures
- 1.9 Create and use multiple occurrence data structures
- 1.10 Use externally-described data structures
- 1.11 Write logic (including I/O operations) without numbered indicators
- 1.12 Code and use /Free format Calc specifications
- 1.13 Code and use Short Form expressions (e.g., + =)
- 1.14 Translate operation codes not supported in /Free form (e.g., MOVE, CALL, etc. into /Free form)
- 1.15 Use qualified Data Structures
- 1.16 Use pointer data types
- 1.17 Code and use Named Constants
- 1.18 Prototype program Calls
- 1.19 Determine appropriate use of passing parameters by value versus by reference
- 1.20 Prototype System APIs and C functions
- 1.21 Understand the ability for RPG procedures to call and be called by Java Methods
- 1.22 Enumerate advantages of Prototypes compared with PARM and PLIST
- 1.23 Determine appropriate use for prototype keywords, such as CONST, VALUE, and OPTIONS (*NOPASS, *OMIT, *VARSIZE)
Section 4 - Advanced RPG techniques (25%)
Given an example of a complex logical expression, determine its results
Given an example of deeply-nested logic within a sample of RPG code, determine the results of running the code
Use Data Structure arrays
Code complex D-specs (e.g., OVERLAY, coding fields without attributes, etc.)
D DataStruct1 DS QUALIFIED
D Field1 15A INZ('12345ABCDE12345')
D Field2 5A OVERLAY(Field1)
D Field3 5A OVERLAY(Field1:*NEXT)
D Field4 5A OVERLAY(Field1:*NEXT)
D Field5 7A OVERLAY(Field3:3)
D DataStruct2 DS LIKEDS(DataStruct1) INZ(*LIKEDS)
D Name S 20 D Long_name S +5 LIKE(Name) D Lda_fld S LIKE(Name) DTAARA(*LDA)
Use modern techniques to handle numbered indicators
Determine appropriate use of system APIs
Code subprocedures
Internal Program Sub-Procedure
D Inter_Func PR 10I 0 D Term1 5I 0 VALUE D Term2 5I 0 VALUE D Term3 5I 0 VALUE
External Module Sub-Procedure
D Extrn_Func PR 10I 0 EXTPROC('MODULE_FUCT')
D Term1 5I 0 VALUE
D Term2 5I 0 VALUE
D Term3 5I 0 VALUE
External Program Sub-Procedure
D Pgm_Func PR 10I 0 EXTPGM('PGM_FUCT')
D Term1 5I 0 VALUE
D Term2 5I 0 VALUE
D Term3 5I 0 VALUE
Declare and use subprocedures
Declare the Function and call it
D Function PR 10I 0 D Term1 5I 0 VALUE D Term2 5I 0 VALUE D Term3 5I 0 VALUE D RC S 10I 0 INZ(*ZEROS) /free RC = Function(Term1:Term2:Term3); *INLR = *ON; RETURN; /end-free
start the function and return the results
P Function B D Function PI 10I 0 D Term1 5I 0 VALUE D Term2 5I 0 VALUE D Term3 5I 0 VALUE D Result S 10I 0 /free Result = Term1 ** 2 * 17 + Term2 * 7 + Term3; return Result; /end-free P Function E
Create and use multiple occurrence data structures
Use externally-described data structures
Write logic (including I/O operations) without numbered indicators
/Free
SETLL (variable1:variable2) filename;
IF %EQUAL(filename);
READE(N) (variable1:variable2) filename;
DOW NOT %EOF(filename);
// logic
READE(N) (variable1:variable2) filename;
ENDDO;
ENDIF;
/End-Free
/Free
CHAIN (variable3) filename;
IF %FOUND(filename);
// logic
UPDATE filerec;
ENDIF;
/End-Free
Code and use /Free format Calc specifications
/Free
// Convert from a char to Num
num = %DEC(char);
// Chain to the correct record, checking for error with no rec lock
CHAIN(EN) (char) filename1;
IF %FOUND(filename1) and NOT %ERROR; // If Condiditon
CHAIN (num) filename2; // Chain to next file
IF %FOUND(filename2); // If Condition
filevar1 += 1;
filevar2 = char;
filevar3 = proc_call(filevar1:filevar2); // Call a Procedure
// Update only field filevar3 in filename2
UPDATE filerec2 %FIELDS(filevar3);
ENDIF;
ELSEIF %ERROR;
DSPLY 'There was an error';
*INLR = %ERROR;
RETURN;
ENDIF;
*INLR = *ON;
RETURN;
/End-Free
Code and use Short Form expressions (e.g., + =)
i += 1;
