Understanding logic in programing

Question

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I have to answer this question.

Which of the following conditions definitely make the following expression evaluate to false? Select all that apply. Keep in mind the order of evaluation.

a == 15 or b != 5 and c <=10

a) a = 15, b = any positive int, c = any positive int
b) a != 15, b = any positive int, c = any positive int
c) a = any positive int, b = 5, c = any positive in
d) a = any positive int, b = any positive int, c = 100
e) a != 15, b = any positive int, c = 15

why is e the only right answer here? I thought with most of them saying "any positive int" would make them evaluate to false as well!

What I have tried:

I tried to look up why I was wrong on google and I can't find any wirttin answer there.

Posted 27-Feb-22 10:39am

Numantyke

Updated 27-Feb-22 11:07am

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Richard MacCutchan 28-Feb-22 4:48am

The question asks which expressions definitely evaluate to False. So you need to try some sample values in each to see if they can sometimes be True.

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OriginalGriff · Accepted Answer · 2022-02-27T11:07:00

Solution 1

Look at the values and read the question carefully: it gives you the answer explicitly if you read it correctly. Then try the values and see if you can find any value which causes a true result.
Hint:

Quote:
Keep in mind the order of evaluation.

Could be important ...

Posted 27-Feb-22 11:07am

OriginalGriff