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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. Which of the following actions will NOT help increase the maintainability of a program?

A) Proper commenting for each piece of functionality
B) Consolidating redundant code
C) Replacing subroutines with functions
D) Deleting dead code

2. Prerequisite:
A sorted input dataset with record length 100 contains at least one record for all 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 program must not read more records.
4 .) The program must not abend or loop infinitely.
If the following code does not fulfill the requirements above, which would be the reason, if any?
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);
IF EOF_IN THEN LEAVE;
SELECT(INSTRUC .A);
WHEN('1') DO;
Z1 += Z1;
ITERATE LAB;
END;
WHEN('3') DO;
Z3 = Z3 + 1;
LEAVE;
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*/
END;/*LOOP*/

A) The code does not fulfill the requirement, because not all records with '2' in the first byte will be written
to the output dataset.
B) The code fulfills the requirement.
C) The code does not fulfill the requirement, because the READ iteration will not be left when the first
record with '3' in the first byte appears.
D) The code does not fulfill the requirement, because the program will loop infinitely.

3. Which of the following is NOT a characteristic of the RANDOM builtin function?

A) RANDOM can be called without any parameters.
B) The values generated by RANDOM are uniformly distributed between 0 and 1, where 0 < random() < 1.
C) RANDOM can be called with an optional upper bound.
D) RANDOM can be called with an optional SEED to avoid getting repeatable results.

4. In which of the following examples will a dummy argument be passed?

A) PROC (A,B);
DCL (A,B) BIN FIXED;
END C;
END PGM;
B) DCL A EXT ENTRY (FIXED BINARY);
DCL (X,Y) FIXED BIN;
CALL A(X,Y);
C) DCL A EXT ENTRY (FIXED, BINARY);
DCL (X,Y) FIXED BIN;
CALL A(X,Y);
D) PGM: PROC OPTIONS(MAIN);
DCL (X,Y) FIXED BIN;
CALL C (X,Y);
E) DCLA EXT ENTRY;
DCL (X,Y) FIXED BIN;
CALL A(X,Y);

5. A junior programmer has written a 3000 statement program and has asked the team lead for help in
determining how to review it. Which of the following is the most appropriate response for the team lead?

A) Request that the programmer set up an informal walkthrough with key members of the team.
B) Provide the programmer with a list of programming standards.
C) Ask the programmer to compile it and run some tests to see if it can be broken.
D) Inform the programmer that a review is not necessary.

Solutions: