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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. 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) Use the UPPERCASE function instead of SET_TO_UPPERCASE.
B) RETURN(TRANSLATE(CHARSTR,UC,LC)) to avoid the unnecessary assignment to R.
C) Use VALUE on the declares for UC and LC.
D) Declare variables UC and LC as STATIC.

2. Which of the following techniques, if any, can be used to parallelize a PL/I program?

A) Attach a thread to every external entry in the program.
B) Attach threads to pieces or work that are independent from othersB.Attach a thread to every subroutine
in the program.
C) Parallelization is not possible in PL/I program.

3. Given the following declaration for X:
DCLX FIXED DEC(3) INIT (123);
If Y is declared as CHAR, what should its minimum length be to preserve the value 123 if these
statements are executed?
Y = X;
X =Y;

A) 3
B) 4
C) 5
D) 6

4. Which of the following structures will NOT contain padding bytes if the PL/I default for alignment is
applied?

A) DCL 1 A, 2 B FLOAT DEC (16), 2 F FLOAT DEC (16), 2 E FIXED BIN (31), 2 C FIXED DEC (5,2), 2 D
CHAR (3);
B) DCL 1 A, 2 B FLOAT DEC (16), 2 C FLOAT DEC (5,2), 2 D CHAR (3), 2 E FIXED BIN (31), 2 F FLOAT
DEC (16);
C) DCL 1 A, 2 E FIXED BIN (31), 2 C FIXED DEC (5,2), 2 B FLOAT DEC (16), 2 F FLOAT DEC (16), 2 D
CHAR (3);
D) DCL 1 A, 2 B FLOAT DEC (16), 2 F FLOAT DEC (16), 2 C FIXED DEC (5,2), 2 E FIXED BIN (31), 2 D
CHAR (3);

5. Requirement:
The function LEAPYEAR evaluates a given 4-digit number and returns '1'B if it is a leap year, '0'B if it is
not. This function is supposed to work for the years 2004 to 2015.
Leap years occur every four years, except for years ending in 00 that are not divisible by 400. Which of
the following solutions meets the requirement and does NOT need to be changed if the requirement
changes to: The function is supposed to work for the years 1900 to 3000.

A) LEAPYEAR:PROC(YEAR) RETURNS(BIT(1));
DCL YEAR PlC '9999';
DCL (MOD,VERIFY) BUILTIN;
SELECT;
WHEN (VERIFY(YEAR '0123456789') ^= 0) RETURN('0'B);
WHEN (MOD(YEAR,400) = 0) RETURN('l'B); WHEN (MOD(YEAR,100) = 0) RETURN('0'B);
WHEN (MOD(YEAR,4) = 0) RETURN('1'B); OTHER RETURN('0'B);
END;
END LEAPYEAR;
B) LEAPYEAR: PROC(YEAR) RETURNS(BIT(1));
DCL YEAR PlC '9999';
DCL (MOD,VERIFY) BUILTIN;
SELECT;
WHEN (VERIFY(YEAR,'0l23456789') ^= 0) RETURN('0'B);
WHEN (MOD(YEAR,100) = 0)RETURN('0'B);
WHEN (MOD(YEAR,4) = 0)RETURN('1'B);
OTHERRETURN('0'B);
END;
END LEAPYEAR;
C) LEAPYEAR:PROC(YEAR) RETURNS(BIT(1));
DCL YEAR PlC '9999';
DCL (MOD,VERIFY) BUILTIN;
SELECT;
WHEN (VERIFY(YEAR '0123456769') ^= 0) RETURN('0'B); WHEN (MOD(YEAR,100) = 0)
RETURN('0'B);
WHEN (MOD(YEAR,400) = 0) RETURN('1'B);
WHEN (MOD(YEAR,4) = 0) RETURN('1'B);
OTHERRETURN('0'B);
END;
END LEAPYEAR;
D) LEAPYEAR: PROC(YEAR) RETURNS(BIT(1));
DCL YEAR PlC '9999';
DCL VERIFY BUILTIN;
IFVERIFY(YEAR,0123456789)^= 0 THEN RETURN('0'B);
SELECT(YEAR);
WHEN (2004) RETURN('1'B);
WHEN (2008) RETURN('1'B);
WHEN (2012) RETURN('1'B);
OTHER RETURN('0'B);
END;
END LEAPYEAR;

Solutions: