Data Validation/Program Testing

Question 1

Data Verification

Answer 1

To ensure the data entry exactly matches the original source

Question 2

Types of verification?

Answer 2

• Double Entry: Enter data twice and compare the two copies
• Proofreading: Have a person check the data entered against original document

Question 3

Types of validation?

Answer 3

• Presence Check: Ensure data is entered
• Type Check: Ensure suitable data type
• Format Check: Ensure data matches a required arrangement or pattern
• Length Check: Ensure correct number of characters
• Range Check: Ensure within predetermined range
• Check Digit: Allows data to be self-checking

Question 4

Data Entry Errors

Answer 4

• Transcription Errors: Typographical mistakes
• Transposition Errors: Two or more characters positions are accidentally swapped

Question 5

Error Types

Answer 5

• Syntax: When code does not follow syntax rule of the programming language (e.g. misspelling statements or unmatched parenthesis)
• Runtime: takes places during execution of program
• Logic: program runs but does not do what it is expected to do

Question 6

Types of runtime error?

Answer 6

• Input error
• Index out of Bound error
• Undeclared variable error
• Arithmetic error
• Out of Memory error