大型机面试全集coboljclvsamcicsdb2sql

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IBMMAINFRAMES.com

COBOL & COBOL II

Q1) Name the divisions in a COBOL program ?.

A1) IDENTIFICATION DIVISION, ENVIRONMENT DIVISION, DATA

DIVISION, PROCEDURE DIVISION.

Q2) What are the different data types available in COBOL?

A2) Alpha-numeric (X), alphabetic (A) and numeric (9).

Q3) What does the INITIALIZE verb do? - GS

A3) Alphabetic, Alphanumeric fields & alphanumeric edited items are set to

SPACES. Numeric, Numeric edited items set to ZERO. FILLER , OCCURS

DEPENDING ON items left untouched.

Q4) What is 77 level used for ?

A4) Elementary level item. Cannot be subdivisions of other items (cannot be

qualified), nor can they be subdivided themselves.

Q5) What is 88 level used for ?

A5) For condition names.

Q6) What is level 66 used for ?

A6) For RENAMES clause.

Q7) What does the IS NUMERIC clause establish ?

A7) IS NUMERIC can be used on alphanumeric items, signed numeric & packed

decimal items and unsigned 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 - .

Q8) How do you define a table/array in COBOL?

A8) ARRAYS.

05 ARRAY1 PIC X(9) OCCURS 10 TIMES.

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

Q9) Can the OCCURS clause be at the 01 level?

A9) No.

Q10) What is the difference between index and subscript? - GS

A10) 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.

Q11) What is the difference between SEARCH and SEARCH ALL? - GS

IBMMAINFRAMES.com

A11) 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.

Q12) What should be the sorting order for SEARCH ALL? - GS

A12) 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).

Q13) What is binary search?

A13) 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.

Q14) 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?

A14) Must use compiler option SSRANGE if you want array bounds checking. Default is

NOSSRANGE.

Q15) How do you sort in a COBOL program? Give sort file definition, sort

statement syntax and meaning. - GS

A15) 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 (work) file 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 out file 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.

IBMMAINFRAMES.com

Q16) How do you define a sort file in JCL that runs the COBOL program?

A16) 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.

Q17) What is the difference between performing a SECTION and a PARAGRAPH?

- GS

A17) 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.

Q18) What is the use of EVALUATE statement? - GS

A18) 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.

Q19) What are the different forms of EVALUATE statement?

A19)

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

Q20) How do you come out of an EVALUATE statement? - GS

A20) 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.

IBMMAINFRAMES.com

Q31)2 What do you do to resolve SOC-7 error? - GS

Q31) 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

abend’s ( 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 installation might

have batch program debugging

tools. Use them.

Q32) How is sign stored in Packed Decimal fields and Zoned Decimal fields?

Q32) 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.

Q33) How is sign stored in a comp-3 field? - GS

Q33) 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...

Q34) How is sign stored in a COMP field ? - GS

Q34) In the most significant bit. Bit is ON if -ve, OFF if +ve.

Q35) What is the difference between COMP & COMP-3 ?

Q35) COMP is a binary storage format while COMP-3 is packed decimal format.

Q36) What is COMP-1? COMP-2?

Q36) COMP-1 - Single precision floating point. Uses 4 bytes.

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

Q37) How do you define a variable of COMP-1? COMP-2?

Q37) No picture clause to be given. Example 01 WS-VAR USAGE COMP-1.

Q38) How many bytes does a S9(7) COMP-3 field occupy ?

Q38) 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.

剩余63页未读，继续阅读

德记

2013-11-18

很多面试的内容，但都是英文的.学习中

hgj19841115

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