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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. Requirement:
All the characters of the CHAR(3) variable X must be tested to be numeric. Which of the following
solutions meets the requirement and does not require essential structural modifications when the
requirement is changed to the following: The first character of the CHAR(3) variable X must be tested to
be uppercase alphabetic, while the two other characters must be tested to be numeric.

A) DCL NUM CHAR(10) VALUE('0l 23456789');
IF VERIFY(X,NUM) = 0
THEN ... /*NUMERIC*/
B) DCL Y PIC'999';
DCL SWITCH BIT(1) INIT('1'B);
ON CONVERSION BEGIN;
SWITCH =
ONSOURCE = '000';
END;
Y = X;
IF SWITCH
THEN ... ; /*NUMERIC*/
C) DCL ALPHA CHAR(26) VALUE('ABCDEFGHIJKLMNOPQRSTUVWXYZ');
DCL NUM CHAR(10) VALUE('0123456789');
IF TRANSLATE(X,(26)'A'!I(10)'9'ALPHA!!NUM) = '999'
THEN ... ; /*NUMERIC*/
D) IFX >= '000' & X <= '999'
THEN ... /*NUMERIC*/

2. What characterizes the relational model with respect to data storage?

A) Data is stored in hierarchies.
B) Data is stored in tables.
C) Data is stored in segments.
D) Data is stored in variable length and format.

3. Given the following declaration, W has to be assigned to C.
How can a CONVERSION condition be
avoided?
DCL C CHAR(1);
DCL W WIDECHAR(1);

A) IF RANK(W)> 127 THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;
B) IFW ^= CHAR(W)THEN
PUT ('Widechar not is a valid char!');
ELSE
C = W;
C) IF WCHARVAL(W) > 128 THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;
D) IFW >128THEN
PUT ('Widechar is not a valid char!');
ELSE
C = W;

4. An external subroutine procedure requires 10 variables belonging to an input file and 10 variables
belonging to an output file. What is best practice in passing these variables to the procedure?

A) Integrate the 10 variables belonging to the input file in one structure and the 10 variables belonging to
the output file in another one and pass the addresses of them as parameters to the procedure.
B) Declare the 20 variables EXTERNAL in both the calling program and in the procedure called and pass
no variable in the parameter list.
C) Pass the 20 variables individually in the parameter list.
D) Integrate the 20 variables in one structure and pass the address of the structure in the parameter list.

5. What happens after executing the following code, assuming the input file has more than 1 record?
DCL INPFILE FILE RECORD INPUT ENV(VB RECSIZE(100)); DCL P PTR;
DCL B CHAR(100) VARYING BASED(P);
DCLC CHAR(110) VARYING BASED(P);
READ FILE(INPFILE) SET(P);
C=B!! 'EXTENDED
READ FILE(INPFILE) SET(P);

A) The results are unpredictable.
B) Two records are read.
C) ENDFILE condition is raised on the second read.
D) Protection exception because of the reference to B.

Solutions: