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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. Which of the following is the most likely reason to use a debugger in a production environment?

A) Ensure data integrity
B) Enhance performance
C) Investigate error situations
D) Test a program

2. Given the following declaration, W has to be assigned to C.
How can a CONVERSION condition be
avoided?
DCL C CHAR(1);
DCL W WIDECHAR(1);

A) IF WCHARVAL(W) > 128 THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;
B) IFW >128THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;
C) IF RANK(W)> 127 THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;
D) IFW ^= CHAR(W)THEN
PUT ('Widechar not is a valid char!');
ELSE
C = W;

3. In which of the following groups of compiler options could all the options specified cause the compiler to
generate code which requires more time at execution?

A) APCH(5),BIFPREC(31),NOTESTMTUNE(5),NOSERVICE
B) OPTIMIZE(0),NOREDUCE,PIREFIX(SIZE,SUBSCRIPTRANGE)
C) OPTIMIZE(2),DEFAULT(REORDER,NOLAXDCL,NOLAXCTL),STORAGE,MMTEMP(1000)
D) ATTRIBUTES(FULL),XREF(FULL),DEFAULT(EVENDEC,DUMMY(UNALIGNED)),OFFSET

4. Prerequisite:
A sorted input dataset with record length 100 contains at least one record for each of the values '1', '2', '3'
in the first byte. The applied sort criteria is 1,100,ch,a.
Requirements:
1 .) All records with '1' in the first byte must be ignored.
2 .) All records with '2' in the first byte must be written to the output dataset.
3 .) If there is a '3' in the first byte, the read iteration must be left.
4 .) The program must not abend or loop infinitely.
If the code below does not fulfill the specifications provided above, which of the following is the most likely
reason?
DCL DDIN FILE RECORD INPUT;
DCL DDOUT FILE RECORD OUTPUT;
DCL 1 INSTRUC,
3 A CHAR(1),
3 * CHAR(99);
DCL EOF_IN BIT(1) INIT('0'B);
DCL (Z1,Z2,Z3,ZO) BIN FIXED(31) INIT(0);
ON ENDFILE(DDIN) EOF_IN = '1'B;
READ FILE(DDIN) INTO (INSTRUC);
LOOP: DO WHILE (^EOF_IN);
SELECT(INSTRUC.A);
WHEN('1') DO;
Z1 +-= Z1;
ITERATE LOOP;
END;
WHEN('3') DO;
Z3 = Z3+1;
LEAVE LOOP;
END;
WHEN('2') DO;
Z2 = Z2+1;
WRITE FILE(DDOUT) FROM(INSTRUC);
END;
OTHER DO;
ZO = ZO+1;
PUT SKIP LIST(INSTRUC.A);
END;
END;/*select*/
READ FILE(DDIN) INTO(INSTRUC);
END ;/*loop*/

A) The code does not fulfill the requirement because the program will loop infinitely.
B) The code does not fulfill the requirement because the last record with '2' in the first byte will be written twice to the output dataset.
C) The code fulfills the requirement.
D) The code does not fulfill the requirement because not all records with '2' in the first byte will be written to the output dataset.

5. Which of the following is the most appropriate reason to explicitly use COMMIT or ROLLBACK?

A) A batch program performs mass deletions where all deleted rows are independent from each other.
B) The program abends.
C) The program calls unknown subroutines.
D) An online program updates DB2 and IMS objects.

Solutions: