IBM C9050-042 問題集

質問 1：
Which PL/I builtin function can be used to get the system return code from a called program (including
non-PL/I languages)?
A. PLIRETV
B. PLIREST
C. PLIRETC
D. PLISTRA
正解：A

質問 2：
A program reads an input file into a structure with 20 fields. Fifteen of these are required as parameters in
an external procedure. Which of the following is the most efficient way of passing these parameters?
A. Pass 15 variables in a parameter list.
B. Create a structure, assign the 15 variables to it and pass it as one argument.
C. Create a structure, assign the 15 variables to it and pass the address of it in one argument.
D. Pass the address of the input structure as one argument.
正解：D

質問 3：
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 fulfills the requirement.
C. The code does not fulfill the requirement because not all records with '2' in the first byte will be written to the output dataset.
D. 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.
正解：A

質問 4：
Which code should NOT be split out into separate subroutines?
A. Redundant code in a group otprograms.
B. Code which must be available on different platforms.
C. Dead code in a program.
D. Redundant code in a program.
正解：C

質問 5：
SUBSCRIPTRANGE checks which of the following?
A. The subscripts of an array are checked for conformance with iSUB defining rules.
B. The value of each subscript used to refer to an array element is checked for validity beforethe element
is accessed.
C. The value of each subscript used to refer to an array element is checked for validity after the element is
accessed.
D. The address generated for accessing an array element is checked to be sure it falls within the storage
allocated to the array.
正解：B

質問 6：
The following function converts a character string to uppercase. What is the best way to improve the
performance?
SET_TO_UPPERCASE: PROC(CHARSTR) RETURNS (CHAR(120) VARYING);
DCL CHARSTR CHAR(120) VARYING;
DCL UCCHAR(26) INIT('ASCDEFGHIJKLMNOPQRSTUVWXYZ');
DCL LCCHAR(26) INlT('abcdefghijkImnopqrstuvxy'z');
DCL RCHAR(120) VARYING INIT(");
R = TRANSLATE(CHARSTR,UC,LC);
RETURN(R);
END SET_TO_UPPERCASE;
A. Declare variables UC and LC as STATIC.
B. Use the UPPERCASE function instead of SET_TO_UPPERCASE.
C. Use VALUE on the declares for UC and LC.
D. RETURN(TRANSLATE(CHARSTR,UC,LC)) to avoid the unnecessary assignment to R.
正解：B

質問 7：
Which of the following steps is NOT required to use the IBM Debug Tool on a PL/I program?
A. Write an Language Environment user condition handler
B. Compile with TEST option
C. Plan points where the program should stop during testing
D. Have the source code available
正解：A

質問 8：
Lt there is a direct read access to a data object with a unique key (e.g., DB2-SELECT, IMS-GU, ...),
which of the following return codes is possible?
A. OK, duplicate key, database not available
B. OK, end file, not found
C. OK, not found, database not available
D. OK, end file, database not available
正解：C