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kotlinlang

hi guys, one thing that i curious about `and` `&amp;&amp;` for example:
```
        val a = 3
        val b = 4
        val c = 5
        val d = 3

        val result1 = b == c &amp;&amp; a == d

        val result2 = (b == c) and (a == d)
```
1) the result2 if we write `val result2 = b == c and a == d` will not work. not sure why
2) For result1 because the b==c is false. so will not run a==d case. but result2 will get false false so finally will be false. which means result1 only perform one time check and result2 perform 2 times check.
Is my understanding correct?

1) operator precedence, which is a big disadvantage of infix functions in general. That expression without parentheses is interpreted as `((b == c) and a) == d`.

hmmm got it. then what's the benefit we using `and` `or` :thinking_face:

For booleans nothing (except maybe if you want the right hand side side effect but that's pretty obscure); but they're mainly the bitwise operators for intergers.

oh, i understand. Thanks very much for your great explanation.