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Editorial Team
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Asked: 2026-05-27T09:23:42+00:00

Considering that all three variables have identical values, one would expect the following comparison

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Considering that all three variables have identical values, one would expect the following comparison to result in YES:

NSUInteger count1 = 2;
NSUInteger count2 = 2;
NSUInteger count3 = 2;
BOOL countEqual = (count1 == count2 == count3);
// but: countEqual = NO

Alas countEqual is NO and I’d like to better understand why and whether this particular issue also appears in C or C++ code?

My guess is:

(count1 == count2) --> YES (1)
(YES == count3) or (1 == count3) --> NO (0)
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1 Answer

  1. Editorial Team

    The other posters have already provided the answer, so I’ll just quote the relevant part of the spec that confirms it:

    The == (equal to) and != (not equal to) operators are analogous to the relational operators except for their lower precedence. Each of the operators yields 1 if the specified relation is true and 0 if it is false.

    Equality is left associative, so it’s interpreted as:

    count1 == count2 == count3
(count1 == count2) == count3
(1) == count3
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