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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. Given the following code, which call will pass a dummy argument?
PROG: PROC OPTIONS(MAIN);
DCL SUM01 DEC FIXED(5,0) INIT (7);
DCL SUM02 DEC FIXED(9,0) INIT (999);
CALL SUBA(SUM01,
SUM02);
CALL SUSB(SUM01,
SUM02);
CALL SUBC(SUM01,
SUM02);
CALL SUBD(SUM01,
SUM02);
SUBA PROC( PRM1,
PRM2);
DCL PRM1 DEC FIXED (5,0) BYVALUE,
PRM2 DEC FIXED (9,0);
END SUBA;
SUBB:PROC( PRM1,
PRM2);
DCL PRM1 DEC FIXED (5,0),
PRM2 DEC FIXED (9,0);
END SUBD;
SUBC: PROC( PRM 1,
PRM2);
DCL PRM1 BIN FIXED (15,0),
PRM2 DEC FIXED (9,0);
END SUBC;
SUBD:PROC( PRM 1,
PRM2);
DCL PRM1 DEC FIXED(5,0) BYADDR,
PRM2 DEC FIXED (9,0) SYADDP;
END SUBD;
END PROG;

A) CaII to SUBB
B) CaII to SUBD
C) Call to SUBA
D) CaII to SUBC

2. 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.

3. When a program reads a variable record format dataset via LOCATE mode, what happens?

A) READ pointer points to the length bytes in the buffer.
B) READ pointer points to first data byte in the buffer.
C) The ENDFILE condition is never raised.
D) READ data is placed in specified area.

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) Declare the 20 variables EXTERNAL in both the calling program and in the procedure called and pass
no variable in the parameter list.
B) Integrate the 20 variables in one structure and pass the address of the structure in the parameter list.
C) 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.
D) Pass the 20 variables individually in the parameter list.

5. Which of the following is a best practice to make debugging easier?

A) Use the runtime option STORAGE(00,,00,0K)
B) Use a variable updated with the program name.
C) Have the calling program test the return code after the call.
D) CALL PLIDUMP('TFCHAB','Spot Dump'); at key points in the program logic.

Solutions: