How to test for logic operator precedence












7












$begingroup$


While coding in Python, I realized I couldn't remember which is evaluated first:



and (the logical conjunctive operator),
or (the logical disjunctive operator).



Of course, I could've used parentheses (or looked it up), but I wanted to try to find out for myself. I tried endless combinations of False, True, and, and or but could not figure it out.



Given a language with unknown operator precedence, where operators of equal precedence evaluate left-to-right, find a way to conclusively determine whether the logical conjunction or the logical disjunction is evaluated first.



You can only use False, True, and, and or in your answer.



Note: You may assume that or and and definitely have different precedence.






computer-puzzle computer-science







share|improve this question











$endgroup$












  • $begingroup$
    Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
    $endgroup$
    – noedne
    Apr 30 '18 at 1:35










  • $begingroup$
    @noedne Yes. Otherwise they'd have the same precedence
    $endgroup$
    – somebody
    Apr 30 '18 at 1:37






  • 1




    $begingroup$
    @noedne edited.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:34






  • 1




    $begingroup$
    Nice edit. Do we also assume that and and or have different precedence?
    $endgroup$
    – noedne
    Apr 30 '18 at 2:42






  • 1




    $begingroup$
    Yes, as stated (slightly unclearly) in the question. Let me clarify that.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:51
















7












$begingroup$


While coding in Python, I realized I couldn't remember which is evaluated first:



and (the logical conjunctive operator),
or (the logical disjunctive operator).



Of course, I could've used parentheses (or looked it up), but I wanted to try to find out for myself. I tried endless combinations of False, True, and, and or but could not figure it out.



Given a language with unknown operator precedence, where operators of equal precedence evaluate left-to-right, find a way to conclusively determine whether the logical conjunction or the logical disjunction is evaluated first.



You can only use False, True, and, and or in your answer.



Note: You may assume that or and and definitely have different precedence.






computer-puzzle computer-science







share|improve this question











$endgroup$












  • $begingroup$
    Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
    $endgroup$
    – noedne
    Apr 30 '18 at 1:35










  • $begingroup$
    @noedne Yes. Otherwise they'd have the same precedence
    $endgroup$
    – somebody
    Apr 30 '18 at 1:37






  • 1




    $begingroup$
    @noedne edited.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:34






  • 1




    $begingroup$
    Nice edit. Do we also assume that and and or have different precedence?
    $endgroup$
    – noedne
    Apr 30 '18 at 2:42






  • 1




    $begingroup$
    Yes, as stated (slightly unclearly) in the question. Let me clarify that.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:51














7












7








7





$begingroup$


While coding in Python, I realized I couldn't remember which is evaluated first:



and (the logical conjunctive operator),
or (the logical disjunctive operator).



Of course, I could've used parentheses (or looked it up), but I wanted to try to find out for myself. I tried endless combinations of False, True, and, and or but could not figure it out.



Given a language with unknown operator precedence, where operators of equal precedence evaluate left-to-right, find a way to conclusively determine whether the logical conjunction or the logical disjunction is evaluated first.



You can only use False, True, and, and or in your answer.



Note: You may assume that or and and definitely have different precedence.






computer-puzzle computer-science







share|improve this question











$endgroup$




While coding in Python, I realized I couldn't remember which is evaluated first:



and (the logical conjunctive operator),
or (the logical disjunctive operator).



Of course, I could've used parentheses (or looked it up), but I wanted to try to find out for myself. I tried endless combinations of False, True, and, and or but could not figure it out.



Given a language with unknown operator precedence, where operators of equal precedence evaluate left-to-right, find a way to conclusively determine whether the logical conjunction or the logical disjunction is evaluated first.



You can only use False, True, and, and or in your answer.



Note: You may assume that or and and definitely have different precedence.






computer-puzzle computer-science




computer-puzzle computer-science






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 16 mins ago









Gareth McCaughan♦

67.3k3170261




67.3k3170261










asked Apr 30 '18 at 1:25









OldBunny2800OldBunny2800

356213




356213












  • $begingroup$
    Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
    $endgroup$
    – noedne
    Apr 30 '18 at 1:35










  • $begingroup$
    @noedne Yes. Otherwise they'd have the same precedence
    $endgroup$
    – somebody
    Apr 30 '18 at 1:37






  • 1




    $begingroup$
    @noedne edited.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:34






  • 1




    $begingroup$
    Nice edit. Do we also assume that and and or have different precedence?
    $endgroup$
    – noedne
    Apr 30 '18 at 2:42






  • 1




    $begingroup$
    Yes, as stated (slightly unclearly) in the question. Let me clarify that.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:51


















  • $begingroup$
    Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
    $endgroup$
    – noedne
    Apr 30 '18 at 1:35










  • $begingroup$
    @noedne Yes. Otherwise they'd have the same precedence
    $endgroup$
    – somebody
    Apr 30 '18 at 1:37






  • 1




    $begingroup$
    @noedne edited.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:34






  • 1




    $begingroup$
    Nice edit. Do we also assume that and and or have different precedence?
    $endgroup$
    – noedne
    Apr 30 '18 at 2:42






  • 1




    $begingroup$
    Yes, as stated (slightly unclearly) in the question. Let me clarify that.
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 2:51
















$begingroup$
Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
$endgroup$
– noedne
Apr 30 '18 at 1:35




$begingroup$
Are we assuming operator precedence either (1) evaluates all and left to right and then all or left to right, or (2) evaluates all or left to right and then all and left to right?
$endgroup$
– noedne
Apr 30 '18 at 1:35












$begingroup$
@noedne Yes. Otherwise they'd have the same precedence
$endgroup$
– somebody
Apr 30 '18 at 1:37




$begingroup$
@noedne Yes. Otherwise they'd have the same precedence
$endgroup$
– somebody
Apr 30 '18 at 1:37




1




1




$begingroup$
@noedne edited.
$endgroup$
– OldBunny2800
Apr 30 '18 at 2:34




$begingroup$
@noedne edited.
$endgroup$
– OldBunny2800
Apr 30 '18 at 2:34




1




1




$begingroup$
Nice edit. Do we also assume that and and or have different precedence?
$endgroup$
– noedne
Apr 30 '18 at 2:42




$begingroup$
Nice edit. Do we also assume that and and or have different precedence?
$endgroup$
– noedne
Apr 30 '18 at 2:42




1




1




$begingroup$
Yes, as stated (slightly unclearly) in the question. Let me clarify that.
$endgroup$
– OldBunny2800
Apr 30 '18 at 2:51




$begingroup$
Yes, as stated (slightly unclearly) in the question. Let me clarify that.
$endgroup$
– OldBunny2800
Apr 30 '18 at 2:51










1 Answer
1






active

oldest

votes


















14












$begingroup$


True or True and False


Giving True means 'and' then 'or'. Giving False means 'or' then 'and'.




Bonus:




False and True or True


Also use this to test if the precedence is same. If both tests are resulting different value (first test gives False and second test gives True) then the precedence is same.







share|improve this answer









$endgroup$













  • $begingroup$
    Wow, how did I not think of that… facepalm Good job!
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 1:42






  • 3




    $begingroup$
    The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
    $endgroup$
    – Kruga
    Apr 30 '18 at 8:58












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1 Answer
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active

oldest

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1 Answer
1






active

oldest

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active

oldest

votes






active

oldest

votes









14












$begingroup$


True or True and False


Giving True means 'and' then 'or'. Giving False means 'or' then 'and'.




Bonus:




False and True or True


Also use this to test if the precedence is same. If both tests are resulting different value (first test gives False and second test gives True) then the precedence is same.







share|improve this answer









$endgroup$













  • $begingroup$
    Wow, how did I not think of that… facepalm Good job!
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 1:42






  • 3




    $begingroup$
    The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
    $endgroup$
    – Kruga
    Apr 30 '18 at 8:58
















14












$begingroup$


True or True and False


Giving True means 'and' then 'or'. Giving False means 'or' then 'and'.




Bonus:




False and True or True


Also use this to test if the precedence is same. If both tests are resulting different value (first test gives False and second test gives True) then the precedence is same.







share|improve this answer









$endgroup$













  • $begingroup$
    Wow, how did I not think of that… facepalm Good job!
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 1:42






  • 3




    $begingroup$
    The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
    $endgroup$
    – Kruga
    Apr 30 '18 at 8:58














14












14








14





$begingroup$


True or True and False


Giving True means 'and' then 'or'. Giving False means 'or' then 'and'.




Bonus:




False and True or True


Also use this to test if the precedence is same. If both tests are resulting different value (first test gives False and second test gives True) then the precedence is same.







share|improve this answer









$endgroup$




True or True and False


Giving True means 'and' then 'or'. Giving False means 'or' then 'and'.




Bonus:




False and True or True


Also use this to test if the precedence is same. If both tests are resulting different value (first test gives False and second test gives True) then the precedence is same.








share|improve this answer












share|improve this answer



share|improve this answer










answered Apr 30 '18 at 1:37









athinathin

8,61222776




8,61222776












  • $begingroup$
    Wow, how did I not think of that… facepalm Good job!
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 1:42






  • 3




    $begingroup$
    The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
    $endgroup$
    – Kruga
    Apr 30 '18 at 8:58


















  • $begingroup$
    Wow, how did I not think of that… facepalm Good job!
    $endgroup$
    – OldBunny2800
    Apr 30 '18 at 1:42






  • 3




    $begingroup$
    The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
    $endgroup$
    – Kruga
    Apr 30 '18 at 8:58
















$begingroup$
Wow, how did I not think of that… facepalm Good job!
$endgroup$
– OldBunny2800
Apr 30 '18 at 1:42




$begingroup$
Wow, how did I not think of that… facepalm Good job!
$endgroup$
– OldBunny2800
Apr 30 '18 at 1:42




3




3




$begingroup$
The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
$endgroup$
– Kruga
Apr 30 '18 at 8:58




$begingroup$
The middle value is actually irrelevant. It could be either true or false and the test would still work the same.
$endgroup$
– Kruga
Apr 30 '18 at 8:58


















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