IBM C9050-042 問題集

質問 1：
WIDECHAR can be converted to CHAR. Which rule has to be observed?
A. Each WIDECHAR value has to be less than '0080'WX, otherwise CONVERSION is raised.
B. Each WIDECHAR value has to be less than or equal to '00FF'WX, otherwise CONVERSIONis raised.
C. By conversion of WIDECHAR to CHAR the left byte is omitted.
D. All WIDECHAR values can be converted to CHAP using the appropriate builtin function.
正解：A

質問 2：
Given the following code, which procedure call would cause the "Pointer corrupted!" message to be output
provided that the PL/I compile time option CHECK(STORAGE) has been specified?
DCLX FIXED BIN(31) BASED (P);
DCL Y CHAR (5) BASED (P);
DCL P POINTER;
SUB: PROCEDURE (P);
DCL P POINTER;
if CHECKSTG(P) THEN PUT ('Pointer 0k!');
ELSE PUT ('Pointer corrupted!');
END;
A. ALLOCATEY;
Y = 'ABCDE';
CALL SUB (ADDR(X));
B. ALLOCATEX;
Y = 'ABCD';
CALL SUB (P);
C. P = ALLOCATE (100);
Y = 'ABCDE';
CALL SUB (ADDR(X));
D. ALLOCATEY;
Y = 'ABCDE';
CALL SUB (P);
正解：B

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

質問 4：
Which compiler option causes the compiler to flag any IF, WHILE, UNTIL and WHEN clauses that do not
have the attributes BIT(1) NONVARYING?
A. RULES(NOLAXUNTIL)
B. RULES(NOLAXWHEN)
C. RULES(NOLAXIF)
D. RULES(NOLAXWHILE)
正解：C

質問 5：
Program A calls program B with PC as a parameter defined BIN FIXED (31 .0). Program B sets PC as
follows:
0 OK
4 WARNING
8 ERROR
Which of the following is the most appropriate statement for testing the PC variable?
A. SELECT (RC);
WHEN (0, 4);
OTHERWISE
PUT SKIP LIST('UNKNOWN VALUE FROM B');
END;
B. SELECT (RC); WHEN (0,4); WHEN (8) PUT SKIP LIST ('ERROR IN B');
OTHERWISE PUT SKIP LIST('UNKNOWN VALUE FROM B');
END;
C. IF (RC >4) THEN PUT SKIP LIST('ERROR IN B');
ELSE PUT SKIP LIST('UNKNOWN VALUE FROM B');
D. IF (RC ^= 0) & (RC ^= 4) THEN PUT SKIP LIST('ERROR IN B');
ELSE IF RC> 8 THEN PUT SKIP LIST('UNKNOWN VALUE FROM B);
正解：B

質問 6：
What happens after the following statements?
DCLI,J CHAR(5) INIT('54321');
I = J;
PUT LIST(l);
A. CONVERSION condition will be raised.
B. 5.4321E+04 will be printed.
C. 54321 will be printed.
D. SIZE condition will be raised.
正解：D

質問 7：
A given PL/I program has a big nesting depth. Which of the following measures will help to reduce the
nesting depth in most cases?
A. Using SELECT constructs instead of If-THEN-ELSE
B. Avoiding OTHER clauses
C. Avoiding ELSE clauses
D. Using DO-WHILE as the only loop technique
正解：A

質問 8：
What characterizes the relational model with respect to data storage?
A. Data is stored in variable length and format.
B. Data is stored in tables.
C. Data is stored in segments.
D. Data is stored in hierarchies.
正解：B