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ISTQB CTAL-TTA Exam - Topic 1 Question 31 Discussion
Topic #: 1
A review of the following pseudo code is to be performed using a checklist:
Module Vowel Counter
Message: array of Characters
M, N: Integer
ACount, ECount, ICount, OCount, UCount: Integer
BEGIN
I=1
Read Nextchar
While Nextchar <> 'S'
DO
Message (I) = Nextchar
I = I+1
Read Nextchar
ENDWHILE
FOR M = 1 To I
DO
Print (Message(M))
IF Message (M) = 'E'
THEN
ECount = ECount + 1
ELSE
IF Message (M) = 'A'
THEN
ACount = ACount + 1
ELSE
IF Message (M) = 'I'
THEN
ICount = ICount + 1
ELSE
IF Message (M) = 'O'
THEN
OCount = OCount + 1
ELSE
IF Message (M) = 'U'
THEN
UCount = UCount + 1
ENDIF
ENDIF
ENDIF
ENDIF
ENDIF
ENDFOR
Print ('Message contains ' ACount + ECount + ICount + OCount + UCount ' vowels')
END
Which of the following checklist items would find code errors in this scenario?
A) Are all variables properly declared?
B) Are all loops, branches, and logic constructs complete, correct, and properly nested?
C) Are all cases covered in an IF-ELSEIF, including ELSE or DEFAULT clauses?
D) Are loop termination conditions obvious and invariably achievable?
E) Are there any redundant or unused variables?
Analysis:
The given pseudo code for the Vowel Counter module contains potential issues that can be identified using a checklist.
Checklist Items:
B . Are all loops, branches, and logic constructs complete, correct, and properly nested?:
This item will help identify errors in the structure and nesting of loops and conditional statements. Proper nesting and completeness are crucial for the code to execute as intended.
C . Are all cases covered in an IF-ELSEIF, including ELSE or DEFAULT clauses?:
This item ensures that all possible cases are accounted for in conditional statements, including a final ELSE clause to handle unexpected values. This is important to avoid logical errors where certain conditions are not handled.
Explanation of Incorrect Options:
A . Are all variables properly declared?:
While important, this item does not directly address the issues related to loop and conditional logic completeness and correctness.
D . Are loop termination conditions obvious and invariably achievable?:
This item focuses on ensuring that loops will always terminate correctly, but does not address the completeness and correctness of the nested logic.
E . Are there any redundant or unused variables?:
This item helps identify variables that are declared but not used, which is not directly relevant to the correctness of the logic constructs.
The ISTQB CTAL-TTA syllabus and standard code review practices emphasize the importance of checking for proper nesting and completeness of logic constructs to ensure reliable and maintainable code.
Sources:
ISTQB-CTAL-TTA Syllabus
General knowledge on code review and checklist practices.
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