Programming with IBM Enterprise PL/I v5.0

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A programmer has been asked to write a program that tests a variable, X, and writes out A,
B, C or D if X is 0, 1, 2 or 3 respectively and writes out E when X has none of those values.
Which of the following programs represents the best practice using IF or SELECT statements?

  • A. SUB1: PROC( X );DCL X FIXED UNSIGNED;IF X = 0 THENPUT SKIP LIST ( 'A');ELSEIF X = 1 THENPUT SKIP LIST ( 'B');ELSEIF X = 2 THENPUT SKIP LIST ( 'C');ELSEIF X = 3 THENPUT SKIP LIST ( 'D');ELSEPUT SKIP LIST ( 'E');END;
  • B. SUB2: PROC ( X );DCL X FIXED UNSIGNED;IF X < 2 THENIF X = 0 THENPUT SKIP LIST ( 'A');ELSEPUT SKIP LIST ( 'B');ELSEIF X = 2 THENPUT SKIP LIST ( 'C');ELSEIF X = 3 THENPUT SKIP LIST ( 'D');ELSEPUT SKIP LIST ( 'E');END;
  • C. SUB3: PROC( X ); DCL X FIXED UNSIGNED;SELECT;WHEN ( X = 0 )PUT SKIP LIST ( 'A');WHEN( X = 1 )PUT SKIP LIST ( 'B');WHEN( X = 2 )PUT SKIP LIST ( 'C');WHEN( X = 3 )PUT SKIP LIST ( 'D');OTHERWISEPUT SKIP LIST ( 'E');END;END;
  • D. SUB4: PROC( X ); DCL X FIXED UNSIGNED;SELECT ( X );WHEN ( 0 )PUT SKIP LIST ( 'A');WHEN ( 1 )PUT SKIP LIST ( 'B');WHEN ( 2 )PUT SKIP LIST ( 'C');WHEN ( 3 )PUT SKIP LIST ( 'D');OTHERWISEPUT SKIP LIST ( 'E');END;END;


Answer : D

To validate the assignment in the following code, which condition should be enabled?
TEST: PROC(A, B);
DCL (A, B) CHAR (*);
A = B;
END;

  • A. SIZE
  • B. STRINGRANGE
  • C. STRINGSIZE
  • D. SUBSCRIPTRANGE


Answer : C

Which of the following would NOT access the third element of A?
DCL 1 XY(5),
2 A(4) CHAR(4);

  • A. XY(1,3).A
  • B. XY.A(1,3)
  • C. XY(1).A(3)
  • D. XY(3).A(1)


Answer : D

The following code calls an external function procedure. Which program matches the entry declaration?
DCL F FLOAT;
DCL X CHAR(1);
DCL FUN ENTRY (FIXED BIN (15), FLOAT) RETURNS (CHAR(1));
X = FUN(1, F);

  • A. FUN: PROCEDURE (K, F) RETURNS (CHAR(1));DCL K FIXED BIN (15);DCL F FLOAT;END;
  • B. FUN: PROCEDURE (K, F) RETURNS (CHAR(1));DCL K FIXED BIN (31);DCL F FLOAT;END;
  • C. FUN: PROCEDURE (K, F) RETURNS (CHAR(1));DCL K FIXED DEC (15);DCL F FLOAT;END;
  • D. FUN: PROCEDURE (K, F) RETURNS (FIXED BIN (15));DCL K FIXED BIN (15);DCL F FLOAT;END;


Answer : A

If the physical dataset referred to by DDOUT has a record length of 200 and RECFM=F, what happens after executing the following code?
DCL DDOUT FILE RECORD OUTPUT;
DCL OUT_CHAR CHAR(200) INIT('Hello World');
WRITE FILE(DDOUT) FROM(OUT_CHAR);

  • A. One record with a length of 11 will be written to the output file.
  • B. One record with a length of 200 will be written to the output file.
  • C. Compiler error because there is no OPEN statement.
  • D. Runtime error because there is no OPEN statement.


Answer : B

Given the following code, what construct is equivalent?
SELECT;
WHEN (A < 1) B += 1;
WHEN (A < 2) B += 2;
WHEN (A < 3) B += 3;
OTHERWISE B = 0;
END;

  • A. IF A < 1 THENB += 1;ELSEIF A < 2 THENB += 2;ELSEIF A < 3 THENB += 3;ELSEB = 0;
  • B. IF A < 1 THEN B += 1;IF A < 2 THEN B += 2;IF A < 3 THEN B += 3;ELSE B = 0;
  • C. SELECT;WHEN (A < 3) B += 3;WHEN (A < 2) B += 2;WHEN (A < 1) B += 1;OTHERWISE B = 0;END;
  • D. SELECT;WHEN (A < 1) B += 1;WHEN (A < 2) B += 2;WHEN (A < 3) B += 3;END;


Answer : A

Given the following program, the compiler will produce the warning message "The structure member A2 is declared without any data attributes. A level number may be incorrect.".
What is the best way to correct the program?
TEST: PROC OPTIONS(MAIN);

DCL -
1 A,
3 A1 FIXED BIN(31),
3 A2,
3 A3 FIXED BIN(31),
3 A4 FIXED BIN(31);
END;

  • A. Add the attribute CHAR(8) to the declare for A2
  • B. Change the level number on the declare for A2 to 2
  • C. Change the level number on the declare for A3 to 4
  • D. Change the level numbers on the declares for A3 and A4 to 4


Answer : D

What changes should be made, if any, to the following code?
DCL A CHAR(100) BASED(P);
DCL P PTR;
READ FILE(DDIN) INTO(A);

  • A. READ FILE(DDIN) SET(A);
  • B. READ FILE(DDIN) INTO(P);
  • C. READ FILE(DDIN) SET(P);
  • D. No changes necessary because the code is correct.


Answer : C

Which of the following pieces of code will result in a compiler error message?

  • A. ON ENDFILE (SYSIN)DO;PUT LIST('End of file reached.');EOF = '1'B;END;
  • B. ON ENDFILE (SYSIN)BEGIN;PUT LIST('End of file reached.');EOF = '1'B;END;
  • C. IF EOF THENDO;K = 0;L = 1;END;
  • D. IF EOF THENBEGIN;K = 0;L = 1;END;


Answer : A

What is the most appropriate declaration for the variable A?
A = 'ABCDEF';

  • A. DCL A BIN FIXED(15);
  • B. DCL A CHAR(6);
  • C. DCL A DEC FIXED (15,3);
  • D. DCL A PIC '999999';


Answer : B

What will be printed when the following subroutine is called for the third time?
A : PROC;
DCL X PIC '9' INIT(0);
X = X + 1;
PUT SKIP LIST ('THE VALUE OF X IS :'!!X);
X = X + 1;
END A;

  • A. THE VALUE OF X IS :1
  • B. THE VALUE OF X IS :2
  • C. THE VALUE OF X IS :3
  • D. THE VALUE OF X IS :5


Answer : A

Given the following piece of code, what will be output?

  • A. PROCEDURE OPTIONS (MAIN); DCL K CHAR (1) INIT ('A'); CALL B;
  • B. PROCEDURE; DCL K CHAR (1) INIT ('B'); CALL C;
  • C. PROCEDURE ; DCL K CHAR (1) INIT ('C'); PUT (K); CALL D; END C;
  • D. PROCEDURE; PUT (K); END D; END B; PUT (K); END A;
  • E. C A A
  • F. C C A
  • G. C B A
  • H. C A B


Answer : C

If the physical dataset referred to by DDOUT has a maximum record length of 196 and a
RECFM=V, what happens after executing the following code?
DCL DDOUT FILE RECORD OUTPUT;
DCL OUT_CHAR CHAR(500) VARYING INIT((220) ' ');
OPEN FILE(DDOUT);
WRITE FILE(DDOUT) FROM(OUT_CHAR);

  • A. One record with a length of 220 will be written to the output file.
  • B. One record with a length of 500 will be written to the output file.
  • C. One record with a length of 196 will be written to the output file.
  • D. An error will occur because of mismatch of record length.


Answer : D

Which is the most appropriate code to turn all of the bits in A ON?
DCL A BIT(8);

  • A. A = 255;
  • B. A = '11111111'B;
  • C. A = 11111111B;
  • D. A = -1;


Answer : B

In which of the following situations can a subroutine be replaced by a function without any major changes to the code?

  • A. When the subroutine changes an array parameter
  • B. When the subroutine changes a structure parameter
  • C. When the subroutine changes more than one parameter
  • D. When the subroutine changes only one scalar parameter


Answer : D

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