Cobol Interview Questions - An interviewhelper.org blog

What are the steps you go through while creating a COBOL program executable

2009-03-09T04:53:00.000-07:00

Question :What are the steps you go through while creating a COBOL program executable?
Answer :DB2 precompiler (if embedded sql used), CICS translator (if CICS pgm), Cobol compiler, Link editor.

If DB2 program, create plan by binding the DBRMs.

What are the differences between OS VS COBOL and VS COBOL II

2009-03-09T04:52:00.000-07:00

Question :What are the differences between OS VS COBOL and VS COBOL II?
Answer :OS/VS Cobol pgms can only run in 24 bit addressing mode, VS Cobol II pgms can run either in 24 bit or 31 bit addressing modes.

Report writer is supported only in OS/VS Cobol.

USAGE IS POINTER is supported only in VS COBOL II.

Reference modification eg: WS-VAR(1:2) is supported only in VS COBOL II.

EVALUATE is supported only in VS COBOL II.

Scope terminators are supported only in VS COBOL II.

OS/VS Cobol follows ANSI 74 stds while VS COBOL II follows ANSI 85 stds.
Under CICS Calls between VS COBOL II programs are supported.

. How can you submit a job from COBOL programs

2009-03-09T04:50:00.002-07:00

Question : How can you submit a job from COBOL programs?
Answer :Write JCL cards to a dataset with

//xxxxxxx SYSOUT=(A,INTRDR) where 'A' is output class, and dataset should be opened for output in the program. Define a 80 byte record layout for the file.

How do you set a return code to the JCL from a COBOL program

2009-03-09T04:50:00.001-07:00

Question :How do you set a return code to the JCL from a COBOL program?
Answer :Move a value to RETURN-CODE register. RETURN-CODE should not be declared in your program.

What is SSRANGE, NOSSRANGE

2009-03-09T04:48:00.000-07:00

Question :What is SSRANGE, NOSSRANGE ?
Answer :These are compiler options w.r.t subscript out of range checking. NOSSRANGE is the default and if chosen, no run time error will be flagged if your index or subscript goes out of the permissible range.

What is AMODE(24), AMODE(31), RMODE(24) and RMODE(ANY)? ( applicable to only

2009-03-09T04:46:00.000-07:00

Question :What is AMODE(24), AMODE(31), RMODE(24) and RMODE(ANY)? ( applicable to only

MVS/ESA Enterprise Server).
Answer :These are compile/link edit options.

AMODE - Addressing mode. RMODE - Residency mode.

AMODE(24) - 24 bit addressing. AMODE(31) - 31 bit addressing. AMODE(ANY) - Either 24 bit or 31 bit addressing depending on RMODE.

RMODE(24) - Resides in virtual storage below 16 Meg line. Use this for 31 bit programs that call 24 bit programs. (OS/VS Cobol pgms use 24 bit addresses only).

RMODE(ANY) - Can reside above or below 16 Meg line.

What is Static,Dynamic linking

2009-03-09T04:45:00.000-07:00

Question :What is Static,Dynamic linking ?
Answer :In static linking, the called subroutine is link-edited into the calling program , while in dynamic linking, the subroutine & the main program will exist as separate load modules. You choose static/dynamic linking by choosing either the DYNAM or NODYNAM link edit option. (Even if you choose NODYNAM, a CALL identifier (as opposed to a CALL literal), will translate to a DYNAMIC call).

A statically called subroutine will not be in its initial state the next time it is called unless you explicitly use INITIAL or you do a CANCEL. A dynamically called routine will always be in its initial state.

What is file status 39

2009-03-09T04:44:00.000-07:00

Question :What is file status 39 ?
Answer :Mismatch in LRECL or BLOCKSIZE or RECFM between your COBOL pgm & the JCL (or the dataset label). You will get file status 39 on an OPEN.

What is file status 92

2009-03-09T04:43:00.000-07:00

Question :What is file status 92?
Answer :Logic error. e.g., a file is opened for input and an attempt is made to write to it.

Can you REWRITE a record in an ESDS file Can you DELETE a record from it

2009-03-09T04:37:00.000-07:00

Question :Can you REWRITE a record in an ESDS file? Can you DELETE a record from it?
Answer :Can rewrite(record length must be same), but not delete.

What is the mode in which you will OPEN a file for writing

2009-03-09T04:23:00.002-07:00

Question :What is the mode in which you will OPEN a file for writing?
Answer :OUTPUT, EXTEND

What are different file OPEN modes available in COBOL

2009-03-09T04:23:00.001-07:00

Question :What are different file OPEN modes available in COBOL?
Answer :Open for INPUT, OUTPUT, I-O, EXTEND.

How do you reference the following file formats from COBOL programs

2009-03-09T04:22:00.000-07:00

Question :How do you reference the following file formats from COBOL programs:
Answer :Fixed Block File - Use ORGANISATION IS SEQUENTIAL. Use RECORDING MODE IS F, BLOCK CONTAINS 0 .

Fixed Unblocked - Use ORGANISATION IS SEQUENTIAL. Use RECORDING MODE IS F, do not use BLOCK CONTAINS

Variable Block File - Use ORGANISATION IS SEQUENTIAL. Use RECORDING MODE IS V, BLOCK CONTAINS 0. Do not code the 4 bytes for record length in FD ie JCL rec length will be max rec length in pgm + 4

Variable Unblocked - Use ORGANISATION IS SEQUENTIAL. Use RECORDING MODE IS V, do not use BLOCK CONTAINS. Do not code 4 bytes for record length in FD ie JCL rec length will be max rec length in pgm + 4.

ESDS VSAM file - Use ORGANISATION IS SEQUENTIAL.

KSDS VSAM file - Use ORGANISATION IS INDEXED, RECORD KEY IS, ALTERNATE RECORD KEY IS

RRDS File - Use ORGANISATION IS RELATIVE, RELATIVE KEY IS

Printer File - Use ORGANISATION IS SEQUENTIAL. Use RECORDING MODE IS F, BLOCK CONTAINS 0. (Use RECFM=FBA in JCL DCB).

What is the maximum size of a 01 level item in COBOL I in COBOL II

2009-03-09T04:21:00.000-07:00

Question :What is the maximum size of a 01 level item in COBOL I? in COBOL II?
Answer :In COBOL II: 16777215

What is COMP SYNC

2009-03-09T04:20:00.000-07:00

Question :What is COMP SYNC?
Answer :Causes the item to be aligned on natural boundaries. Can be SYNCHRONIZED LEFT or RIGHT.

For binary data items, the address resolution is faster if they are located at word boundaries in the memory. For example, on main frame the memory word size is 4 bytes. This means that each word will start from an address divisible by 4. If my first variable is x(3) and next

one is s9(4) comp, then if you do not specify the SYNC clause, S9(4) COMP will start from byte 3 ( assuming that it starts from 0 ). If you specify SYNC, then the binary data item will start from address 4. You might see some wastage of memory, but the access to this

computational field is faster.

What is the maximum value that can be stored in S9(8) COMP

2009-03-09T04:19:00.000-07:00

Question :What is the maximum value that can be stored in S9(8) COMP?
Answer :99999999

How many bytes will a S9(8) COMP field occupy

2009-03-09T04:17:00.002-07:00

Question :How many bytes will a S9(8) COMP field occupy ?
Answer :4 bytes.

How many bytes does a S9(7) SIGN TRAILING SEPARATE field occupy

2009-03-09T04:17:00.001-07:00

Question :How many bytes does a S9(7) SIGN TRAILING SEPARATE field occupy?
Answer :Will occupy 8 bytes (one extra byte for sign).

How do you define a variable of COMP-1 COMP-2

2009-03-09T04:16:00.000-07:00

Question :How do you define a variable of COMP-1? COMP-2?
Answer :No picture clause to be given. Example 01 WS-VAR USAGE COMP-1.

38. How many bytes does a S9(7) COMP-3 field occupy ?

Will take 4 bytes. Sign is stored as hex value in the last nibble.

General formula is INT((n/2) + 1)), where n=7 in this example.

What is COMP-1 COMP-2

2009-03-09T04:15:00.002-07:00

Question :What is COMP-1? COMP-2?
Answer :COMP-1 - Single precision floating point. Uses 4 bytes.

COMP-2 - Double precision floating point. Uses 8 bytes.

What is the difference between COMP & COMP-3

2009-03-09T04:15:00.001-07:00

Question :What is the difference between COMP & COMP-3?
Answer :COMP is a binary storage format while COMP-3 is packed decimal format.

How is sign stored in a COMP field

2009-03-09T04:14:00.000-07:00

Question :How is sign stored in a COMP field ?
Answer :In the most significant bit. Bit is on if -ve, off if +ve.

How is sign stored in a comp-3 field

2009-03-09T04:13:00.000-07:00

Question :How is sign stored in a comp-3 field?
Answer :It is stored in the last nibble. For example if your number is +100, it stores hex 0C in the last byte, hex 1C if your number is 101, hex 2C if your number is 102, hex 1D if the number is -101, hex 2D if the number is -102 etc...

How is sign stored in Packed Decimal fields and Zoned Decimal fields

2009-03-09T04:12:00.000-07:00

Question :How is sign stored in Packed Decimal fields and Zoned Decimal fields?
Answer :Packed Decimal fields: Sign is stored as a hex value in the last nibble (4 bits ) of the storage.

Zoned Decimal fields: As a default, sign is over punched with the numeric value stored in the last bite.

What do you do to resolve SOC-7 error

2009-03-09T04:11:00.002-07:00

Question :What do you do to resolve SOC-7 error?
Answer :Basically you need to correcting the offending data.

Many times the reason for SOC7 is an un-initialized numeric item. Examine that possibility first.

Many installations provide you a dump for run time abends ( it can be generated also by calling some subroutines or OS services thru assembly language). These dumps provide the offset of the last instruction at which the abend occurred. Examine the compilation output XREF listing to get the verb and the line number of the source code at this offset. Then you can look at the source code to find the bug. To get capture the runtime dumps, you will have to define some datasets (SYSABOUT etc ) in the JCL.

If none of these are helpful, use judgement and DISPLAY to localize the source of error.

Some installtion might have batch program debugging tools. Use them.

Can I redefine an X(200) field with a field of X(100)

2009-03-09T04:11:00.001-07:00

Question :Can I redefine an X(200) field with a field of X(100) ?
Answer :Yes.

Can I redefine an X(100) field with a field of X(200)

2009-03-09T04:10:00.000-07:00

Question :Can I redefine an X(100) field with a field of X(200)?
Answer :Yes. Redefines just causes both fields to start at the same location. For example:

01 WS-TOP PIC X(1)

01 WS-TOP-RED REDEFINES WS-TOP PIC X(2).

If you MOVE '12' to WS-TOP-RED,

DISPLAY WS-TOP will show 1 while

DISPLAY WS-TOP-RED will show 12.

What does EXIT do

2009-03-09T04:09:00.000-07:00

Question :What does EXIT do ?
Answer :Does nothing ! If used, must be the only sentence within a paragraph.

What is the difference between CONTINUE & NEXT SENTENCE

2009-03-09T04:08:00.000-07:00

Question :What is the difference between CONTINUE & NEXT SENTENCE ?
Answer :CONTINUE is like a null statement (do nothing) , while NEXT SENTENCE transfers control to the next sentence (!!) (A sentence is terminated by a period)

When would you use in-line perform

2009-03-09T04:07:00.002-07:00

Question :When would you use in-line perform?
Answer :When the body of the perform will not be used in other paragraphs. If the body of the perform is a generic type of code (used from various other places in the program), it would be better to put the code in a separate para and use PERFORM paraname rather than in-line perform.

How do you do in-line PERFORM

2009-03-09T04:07:00.001-07:00

Question :How do you do in-line PERFORM?
Answer :PERFORM ... ...

END PERFORM

What is a scope terminator Give examples.

2009-03-09T04:06:00.002-07:00

Question :What is a scope terminator? Give examples.
Answer :Scope terminator is used to mark the end of a verb e.g. EVALUATE, END-EVALUATE; IF, END-IF.

In an EVALUATE statement, can I give a complex condition on a when clause

2009-03-09T04:06:00.001-07:00

Question :In an EVALUATE statement, can I give a complex condition on a when clause?
Answer :Yes.

How do you come out of an EVALUATE statement

2009-03-09T04:05:00.000-07:00

Question :How do you come out of an EVALUATE statement?
Answer :After the execution of one of the when clauses, the control is automatically passed on to the next sentence after the EVALUATE statement. There is no need of any extra code.

What are the different forms of EVALUATE statement

2009-03-09T04:04:00.002-07:00

Question :What are the different forms of EVALUATE statement?
Answer :EVALUATE EVALUATE SQLCODE ALSO FILE-STATUS

WHEN A=B AND C=D WHEN 100 ALSO '00'

imperative stmt imperative stmt

WHEN (D+X)/Y = 4 WHEN -305 ALSO '32'

imperative stmt imperative stmt

WHEN OTHER WHEN OTHER

imperative stmt imperative stmt

END-EVALUATE END-EVALUATE

EVALUATE SQLCODE ALSO A=B EVALUATE SQLCODE ALSO TRUE

WHEN 100 ALSO TRUE WHEN 100 ALSO A=B

imperative stmt imperative stmt

WHEN -305 ALSO FALSE WHEN -305 ALSO (A/C=4)

imperative stmt imperative stmt

END-EVALUATE END-EVALUATE

What is the use of EVALUATE statement

2009-03-09T04:04:00.001-07:00

Question :What is the use of EVALUATE statement?
Answer :Evaluate is like a case statement and can be used to replace nested Ifs. The difference between EVALUATE and case is that no 'break' is required for EVALUATE i.e. control comes out of the EVALUATE as soon as one match is made.

What is the difference between performing a SECTION and a PARAGRAPH

2009-03-09T04:03:00.002-07:00

Question :What is the difference between performing a SECTION and a PARAGRAPH?
Answer :Performing a SECTION will cause all the paragraphs that are part of the section, to be performed.

Performing a PARAGRAPH will cause only that paragraph to be performed.

Give the format of USING and GIVING in SORT statement. What are the restrictions with it

2009-03-09T04:03:00.001-07:00

Question :Give the format of USING and GIVING in SORT statement. What are the restrictions with it?
Answer :
See question 16. Restrictions - Cannot massage records, canot select records to be sorted.

What are the two ways of doing sorting in a COBOL program Give the formats.

2009-03-09T04:02:00.001-07:00

Question :What are the two ways of doing sorting in a COBOL program? Give the formats.
Answer :See question 16.

How do you define a sort file in JCL that runs the COBOL program

2009-03-09T04:01:00.002-07:00

Question :How do you define a sort file in JCL that runs the COBOL program?
Answer :Use the SORTWK01, SORTWK02,..... dd names in the step. Number of sort datasets depends on the volume of data being sorted, but a minimum of 3 is required.

How do you sort in a COBOL program Give sort file definition, sort statement syntax and meaning

2009-03-09T04:01:00.001-07:00

Question :How do you sort in a COBOL program? Give sort file definition, sort statement syntax and meaning.
Answer :Syntax:

SORT file-1 ON ASCENDING/DESCENDING KEY key....

USING file-2

GIVING file-3.

USING can be substituted by INPUT PROCEDURE IS para-1 THRU para-2

GIVING can be substituted by OUTPUT PROCEDURE IS para-1 THRU para-2.

file-1 is the sort workfile and must be described using SD entry in FILE SECTION.

file-2 is the input file for the SORT and must be described using an FD entry in FILE SECTION and SELECT clause in FILE CONTROL.

file-3 is the outfile from the SORT and must be described using an FD entry in FILE SECTION and SELECT clause in FILE CONTROL.

file-1, file-2 & file-3 should not be opened explicitly.

INPUT PROCEDURE is executed before the sort and records must be RELEASEd to the sort work file from the input procedure.

OUTPUT PROCEDURE is executed after all records have been sorted. Records from the sort work file must be RETURNed one at a time to the output procedure.

. My program has an array defined to have 10 items. Due to a bug, I find that even if the program access the 11th item in this array, the program d

2009-03-09T04:00:00.001-07:00

Question :My program has an array defined to have 10 items. Due to a bug, I find that even if the program access the 11th item in this array, the program does not abend. What is wrong with it?
Answer :Must use compiler option SSRANGE if you want array bounds checking. Default is NOSSRANGE.

What is binary search

2009-03-09T03:59:00.000-07:00

Question :What is binary search?
Answer :Search on a sorted array. Compare the item to be searched with the item at the center. If it matches, fine else repeat the process with the left half or the right half depending on where the item lies.

What should be the sorting order for SEARCH ALL

2009-03-09T03:58:00.000-07:00

Question :What should be the sorting order for SEARCH ALL?
Answer :It can be either ASCENDING or DESCENDING. ASCENDING is default. If you want the search to be done on an array sorted in descending order, then while defining the array, you should give DESCENDING KEY clause. (You must load the table in the specified order).

What is the difference between SEARCH and SEARCH ALL

2009-03-09T03:57:00.000-07:00

Question :What is the difference between SEARCH and SEARCH ALL?
Answer :SEARCH - is a serial search.

SEARCH ALL - is a binary search & the table must be sorted ( ASCENDING/DESCENDING KEY clause to be used & data loaded in this order) before using SEARCH ALL.

What is the difference between index and subscript

2009-03-09T03:56:00.002-07:00

Question :What is the difference between index and subscript?
Answer :Subscript refers to the array occurrence while index is the displacement (in no of bytes) from the beginning of the array. An index can only be modified using PERFORM, SEARCH & SET.

Need to have index for a table in order to use SEARCH, SEARCH ALL.

Can the OCCURS clause be at the 01 level

2009-03-09T03:56:00.001-07:00

Question :Can the OCCURS clause be at the 01 level?
Answer :No.

How do you Define a table/array in COBOL

2009-03-09T03:55:00.000-07:00

Question :How do you Define a table/array in COBOL?
Answer :01 ARRAYS.

05 ARRAY1 PIC X(9) OCCURS 10 TIMES.

05 ARRAY2 PIC X(6) OCCURS 20 TIMES INDEXED BY WS-INDEX.

What does the IS NUMERIC clause establish

2009-03-09T03:53:00.000-07:00

Question :What does the IS NUMERIC clause establish ?
Answer :IS NUMERIC can be used on alphanumeric items, signed numeric & packed decimal items and usigned numeric & packed decimal items. IS NUMERIC returns TRUE if the item only consists of 0-9. However, if the item being tested is a signed item, then it may contain 0-9, + and - .

What is level 66 used for

2009-03-09T03:52:00.000-07:00

Question :What is level 66 used for ?
Answer :For RENAMES clause.

What is 88 level used for

2009-03-09T03:50:00.000-07:00

Question :What is 88 level used for ?
Answer :For condition names.

What is 77 level used for

2009-03-09T03:49:00.000-07:00

Question :What is 77 level used for ?
Answer :Elementary level item. Cannot be subdivisions of other items (cannot be qualified), nor can they be subdivided themselves.

What does the INITIALIZE verb do

2009-03-09T03:48:00.000-07:00

Question :What does the INITIALIZE verb do?
Answer :Alphabetic, Alphanumeric fields & alphanumeric edited items are set to SPACES.

Numeric, Numeric edited items set to ZERO.

FILLER , OCCURS DEPENDING ON items left untouched.

What are the different data types available in COBOL

2009-03-09T03:45:00.000-07:00

Question :What are the different data types available in COBOL?
Answer :Alpha-numeric (X), alphabetic (A) and numeric (9).

Name the divisions in a COBOL program

2009-03-09T03:34:00.000-07:00

Question :Name the divisions in a COBOL program?
Answer :Identification Division, Environment Division, Data Division, Procedure Division.