CODEWITHSUNDEEP
objective-csyntaxif-statementoperators
commscheck
commscheck

Reputation: 443

Multiple operators in an if statement without AND or OR

I wanted to see if, instead of writing if (row > -1 && row < _rows) I could shorten it to if (-1 < row < _rows). I used the below test to find out (it didn't return any compile errors).

int x = 5;
BOOL test1 = NO;
BOOL test2 = NO;
BOOL test3 = NO;

if (x < 6 && x > 4) {
    test1 = YES;
}
if (4 < x < 6) {
    test2 = YES;
}
if (5 < x < 7) {
    test3 = YES;
}

All three tests came up YES, including the 3rd one which, if my syntax was correct, should've been NO. It looks like this isn't valid syntax, but my question is, what is the compiler actually doing where the syntax (5 < 5 < 7) returns true?

Upvotes: 0

Views: 151

Answers (2)

Adam Schmidt
Adam Schmidt

Reputation: 452

If you want it to not use the logical and operator at all, this should work:

5 < x == 1 == (x < 7)

This evaluates to 1 == 1 == 1 , which is 1 == 1, which is a true value. The parentheses are needed because of how the compiler reads left to right.

Upvotes: 0

Raekye
Raekye

Reputation: 5131

I think it's because 5 < x returns false, which casts to 0, which is less than 7.

Upvotes: 3

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