Interested to Buy Any Domain ? << Click Here >> for more details...
How to read records from flat file in reverse order through
COBOL program?
- 14 Answers
- 74278 Views
- Accenture, Broadridge, IBM, MAT, Polaris, SPIC, Syntel, TCS, Wipro, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / srini
Sort the file based on key in descending order. You can
read the file in reverse order.
| Is This Answer Correct ? | 44 Yes | 27 No |
Answer / shrik
Reading the records into a buffer (array) and using it in
reverse order would be the first idea that comes to mind but
that way doesnt work for file with millions of records.
| Is This Answer Correct ? | 18 Yes | 6 No |
Answer / satty
we can read file in reverse order by using a dynamic array.
first transfer the ps into array and read it by -1 from
counter = no of records in the file
| Is This Answer Correct ? | 7 Yes | 3 No |
Answer / mahendra.ch
first we can move the records to an occurs
then
we can solve this problem by using perform varing 1 by -1
until i=0
hear i = number of racords.
iam shure it works.
thank you....
| Is This Answer Correct ? | 8 Yes | 4 No |
//STEP0100 EXEC PGM=SORT
//SYSOUT DD SYSOUT=*
//SORTIN DD DSN=YOUR INPUT DATASET,DISP=SHR
//SORTOUT DD DSN=YOUR OUTPUT FILE IN REVERSE ORDER,
// DISP=(NEW,CATLG,DELETE),UNIT=SYSDA,
// SPACE=(CYL,(X,Y),RLSE)
//SYSIN DD *
INREC FIELDS=(1,80,SEQNUM,8,ZD)
SORT FIELDS=(81,8,ZD,D)
OUTREC FIELDS=(1,80)
/*
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / laxmaiah
i have some knowledge in flat files,
(open input file-name reversed)
in this type use read the data in reverse order
AND write another file
| Is This Answer Correct ? | 16 Yes | 13 No |
Answer / pa
Being a flat file, we cant be sure that it will have a unique key field. So, External to the cobol program , using SORT utility, we can add a serial no column, and then SORT it in descending order based on that column and read the file sequentially in COBOL program.
| Is This Answer Correct ? | 2 Yes | 0 No |
1. Using FileAid
//STEP0100 EXEC PGM=FILEAID
//SYSPRINT DD SYSOUT=*
//DD01 DD DSN=YOUR INPUT DATASET,DISP=SHR
//DD01O DD DSN=YOUR OUTPUT FILE IN REVERSE ORDER,
// DISP=(NEW,CATLG,DELETE),UNIT=SYSDA,
// SPACE=(CYL,(X,Y),RLSE)
//SYSIN DD *
$$DD01 COPYBACK
/*
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sravani
using rrds it is possible. we can count the no of records using rrds key. by using if we can decrement from last to first
| Is This Answer Correct ? | 0 Yes | 7 No |
How many bytes will be allocated for the following record description entries? 01 REC-A. 05 A PIC S9(4). 05 B PIC XXXBXXX. 05 C PIC ____9.99. 05 D PIC S9(5) COMP-3. 05 E PIC 9(3) COMP.
16 Answers IBM, TCS,
how do u list the abended jobs?
I have a COBOL main program which is calling sub program, the number of calling parameters used in main program are 4 whereas in sub program it's 5. Sub program is passing 5 parameters back to main program Will there be any compilation error? Or main program parameters displays junk values?
Why occurs cannot be used in 01 level in COBOL?
What is cobol?
How do u sort the table for Search ALL? Is it only using ASCENDING KEY IS statement in occurs clause? If the data is input in non ascending order, will the ASC KEY IS automatically sort the data? or will it throw compile time error?
What type of Call you would use if you don;t want the control back to the calling program?
I have one column say 'X' defined as VARCHAR Can anyone tell me What are the different ways to update this column thru COBOL-DB2 program?
1.What is the limit of linkage section?
01 WS-NAME PIC X(10) OCCURES 2. by this we can get ws-name 2 times. My qustion is how can we access the second name
There are two flat files one having 10 records and other having 5 records. write a cobol pgm to find the duplicate records(matching records)from both files.
Hi all, I have a following requirement to write the cobol program. I have to load the 129 variables from input sequential file which are in excel sheet to the cobol inernal table. and after loading into table i have to compare this data with the business file. here compare means controlling the data whether the format(numeric,alpha) is same in the business file and in the table??? i have the same data in input and business file. could anyone please give me any idea of the logic?// i have all the 129 different variables(129rows,1 column)is there .
COBOL 
