Exam 70-483 topic 1 question 54 discussion

Actual exam question from Microsoft's 70-483

Question #: 54
Topic #: 1

You are developing an application that includes the following code segment. (Line numbers are included for reference only.)

You need to ensure that the application accepts only integer input and prompts the user each time non-integer input is entered.
Which code segment should you add at line 19?

A. If (!int.TryParse(sLine, out number))
B. If ((number = Int32.Parse(sLine)) == Single.NaN)
C. If ((number = int.Parse(sLine)) > Int32.MaxValue)
D. If (Int32.TryParse(sLine, out number))

Show Suggested Answer

Suggested Answer: A 🗳️
Int32.TryParse - Converts the string representation of a number to its 32-bit signed integer equivalent. A return value indicates whether the conversion succeeded.
Incorrect Answers:
B, C: These will throwan exception when user enters non-integer value.
D: This is exactly the opposite what we want to achieve.
References: http://msdn.microsoft.com/en-us/library/f02979c7.aspx

by Lifebek at Feb. 18, 2020, 9:42 p.m.

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noussa

4 years, 5 months ago

A is good just missing 32 for int means it should be like this: If (!Int32.TryParse(sLine, out number))

upvoted 1 times

aliwiyao

4 years, 5 months ago

int qnd Int32 sq,e

upvoted 1 times

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Lifebek

5 years, 4 months ago

Shouln't correct answer be D here?

upvoted 1 times

whtvr

5 years, 4 months ago

If (Int32.TryParse(sLine, out number)) if the sLine is not a number, the TryParse will return "false", so in this case, the code will go for the "else" which is wrong, that's why A is correct, with the negation

upvoted 9 times

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