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IBM Developing with IBM Enterprise PL/I Sample Questions:

1. In a multithreading environment, when can a race condition occur between two threads?

A) When they operate synchronously
B) When the threads have the same priority
C) When they periorm an operation on same memory area
D) When they cause a deadlock

2. Given the following code, what will happen?
DCL(K, L) FIXED DEC (1);
K= 1;
L = 2;
PUT SKIP LIST (12+K/L);

A) The resulting value is 6.5.
B) The output is 12.4999999999999.
C) The output is 12.5.
D) The program ends abnormally at runtime.

3. Which of the following statements is best for avoiding synchronously updating a resource?

A) Have several programs update the resource without using ENQ.
B) Lock the entire resource at start of program and release at end of program.
C) Have only program A update the resource without using ENQ.
D) Have all programs use ENQ and WAIT for a specific resource.

4. Given the following pseudocode example, at which label should an unconditional COMMIT be placed
assuming there is a one-to-many relationship between FIL01 and FIL02 and FlL01 contains several
thousand records?
Read record from file FIL01
1 . DO while there are records in FIL01 IF record in FIL01 specifies update THEN DO for all records
matching in FIL02 Update record in FIL02 with information from FIL01 end DO
2 . end IF
3 . Read next record in FIL01
4 . end DO

A) 2
B) 3
C) 4
D) 1

5. A program reads an input file into a structure with 20 fields. Fifteen of these are required as parameters in
an external procedure. Which of the following is the most efficient way of passing these parameters?

A) Pass the address of the input structure as one argument.
B) Create a structure, assign the 15 variables to it and pass it as one argument.
C) Create a structure, assign the 15 variables to it and pass the address of it in one argument.
D) Pass 15 variables in a parameter list.

Solutions: