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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. The following program was written to copy a dataset with record length of 100 to another dataset. If this
requirement has not been fulfilled, which is the most likely reason?
DCL DDIN FILE RECORD INPUT;
DCL DDOUT FILE RECORD OUTPUT;
DCL INSTRUC CHAR(100);
DCL EOF_IN BIT(1) INIT('0'B);
ON ENDFILE(DDIN) EOF_IN = '1'B;
DO UNTIL (EOF_IN);
READ FILE (DDIN) INTO(INSTRUC);
WRITE FILE(DDOUT) FROM(INSTRUC);
END;

A) The code fulfills the requirement.
B) The code does not fulfill the requirement because the OPEN statements are missing.
C) The code does not fulfill the requirement because too many records will be written to the output
dataset.
D) The code does not fulfill the requirement because the input structure is the same as the output
structure.

2. Given the following declarations, which statement correctly refers to X?
DCL R CHAP(10);
DCLX CHAR(10) BASED;
DCL P PTR;
DCLZ CHAR(10);
P = ADDR(R);

A) X='THIS IS X';
B) Z = X;
C) P = ADDR(X);
D) Z = P -> X;

3. In which of the following cases is a performance analyzer tool NOT useful?

A) To identify the code causing a storage overlay
B) To show the frequency and duration of function calls
C) To time and tune programs
D) To locate program hangs and deadlocks

4. A module which is serially reusable has which of the following characteristics?

A) Must contain the necessary logic to reset control variables and data areas at entry or exit and a second
task may not enter the module until the first task has finished
B) Is designed for concurrent execution by multiple tasks
C) Is intended for single use only and must be refreshed from disk before it can be invoked again
D) All or part of it may be replaced at any time by the operating system

5. A compiler listing annotated with execution counts per statement helps identify all of the following
EXCEPT

A) Calls to library routines
B) Potentially miscoded conditions in IFs, WHEREs, WHILEs, and UNTILs
C) Opportunities for code optimization
D) Unexecuted statements and procedures

Solutions: