IBM Developing with IBM Enterprise PL/I 認定 C9050-042 試験問題:

1. In a multithreading environment, when can a deadlock occur between two threads, if at all?

A) When they are operating synchronously
B) When both access the same memory area
C) When they have both locked a resource that the other one requires
D) It can neveroccur.

2. In the following example what value will be printed to SYSPRINT, if any, from the PUT LIST in PGM_A?
PGM_A PROC;
DCL INPARM CHAR (10) INIT('FIRST CALL);
DCL P_OUT PTR;
DCL OUTPARM CHAR(10) BASED (P_OUT);
DCL PGM_B ENTRY(CHAR(10),PTR) EXTERNAL:
CALL P0MB (INPARM,P OUT);
IF OUTPARM = 'RESULT 'THEN
DO;
INPARM = ";
CALL PGM_B (INPARM,P_OUT);
END;
PUT LIST(OUTPARM);
END;
PGM_B: PROC(INPARMP_OUT);
DCL INPARM CHAR (10);
DCL P_OUT PTR;
DCL OUTPARM CHAR (10) INIT(");
P_OUT = ADDR(OUTPARM);
IF INPARM ='FIRST CALL THEN
OUTPARM = 'RESULT ';
ELSE
OUTPARM = 'NO RESULT';
END;

A) 'NO RESULT'
B) Blanks
C) Unpredictable
D) 'RESULT'

3. Which of the following is LEAST likely to be performed by a batch program?

A) Production of pay checks
B) User interaction
C) Sequential file processing
D) Sorting

4. What is the output of the following program?
DCL A AREA(8000);
DCL 1 STR1 BASED(P),
2 STR1_LGTH BIN FIXED(31),
2 STR_CHAR CHAR(ALLOC_LGTH REFER(STR1_LGTH));
DCL ALLOC_LGTH BINFIXED(31);
DCL I FIXED BIN(31);
DCL P PTR;
ALLOC_LGTH = 100;
DO I = 1 TO 10;
ALLOC STR1 IN(A);
END;
PUT SKIP LIST(CSTG(A));

A) 8000
B) 1016
C) 1056
D) 1040

5. What will be printed to SYSPRINT after the following statements?
DCLZZ9 PlC 'ZZ9' INIT(-1);
DCL A CHAR(10) INIT(LOW(10));
DCL B CHAR(10) INIT('PL/l');
SELECT;
WHEN(A = LOW(12))PUT('CASE 1');
WHEN(SUBSTR(B11.3) = 'PL/I') PUT('CASE 2');
WHEN(ZZ9 < 0)PUT('CASE 3');
OTHERPUT('CASE 4');
END;

A) CASE 1
B) CASE 3
C) CASE 2
D) CASE 4

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