what is data structure?how many types of data structers?
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Answer Posted / jeet
Data structure is specified in the Input Specification of an RPG 3 Program where as in RPG 1V we specified in 'D' specification.
Data Structure is define an area in storage and layout related subfields.
There are 4 types of data structures
1) Data Area Data Structure
2) File Information Data Structure
3) Program Status Data Structure
4) Multiple Occurence Data Structure
Data Structure is used for
1) To break fields into subfields
2) To change the format of the field
3) To Group non-contiguous data into contiguous format
4) To convert data.
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I have created a command that display Source file and library. Now i want that when i enter library name and press f4 on Source file, pgm should display all the PF- SRC's in that Library. For F4 option i have used Choice program but since only limited paramters are passed in Choice pgm i am not able to paas library name and further can't call a pgm that will display list of Source files. Below is the Code snippet for CMD type object :- CMD PROMPT('Source Scan for HUB Standard') PARM KWD(SOURCE) TYPE(*CHAR) LEN(1) RSTD(*YES) + VALUES(N A) MIN(1) + CHOICE('N,A') PARM KWD(SRCFILE) TYPE(FILE) RSTD(*NO) + PROMPT('SOURCE FILE') FILE: QUAL TYPE(*NAME) LEN(10) RSTD(*NO) EXPR (*YES) + CHOICE(*PGM) + CHOICEPGM (XXXXXLIB/YYYPGM) QUAL TYPE(*NAME) LEN(10) DFT(*LIBL) + SPCVAL((*LIBL)) EXPR(*YES) PROMPT ('Library') Below is the Choice pgm:- PGM PARM(&PARM1 &PARM2) DCL VAR(&PARM1) TYPE(*CHAR) LEN (21) DCL VAR(&PARM2) TYPE(*CHAR) LEN (2000) IF COND(%SST(&PARM1 1 10) = 'CHOICE ' *AND + %SST(&PARM1 11 10) = 'SRCFILE ' *AND + (%SST(&PARM1 21 1) = 'C' *OR %SST (&PARM1 + 21 1) = 'P')) THEN (DO) /* (%SST(&PARM1 21 1) = 'C' *OR %SST (&PARM1 + */ CHGVAR VAR(&PARM2) VALUE('Name, F4 for List') ENDDO IF COND(%SST(&PARM1 1 10) = 'CHOICE ' *AND + %SST(&PARM1 11 10) = 'SRCFILE ' *AND + %SST(&PARM1 21 1) = 'P') THEN (DO) CHGVAR VAR(&PARM2) VALUE('Name, F4 for List') CALL PGM(GTSQL) PARM ('XXXXLIB') return ENDDO Thanks in Advance for looking into.
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