Don't understand why Conditional "OR" operator not working for me?

java

Solution

Basically all you want is for exactly one of the values `isTeen(a)` and `isTeen(b)` to be true, so use XOR:

if ((a >= 13 && a <= 19) ^ (b >= 13 && b <= 19))

If you replace `^` with `||`, you allow for the possibility of both `a` and `b` being teen numbers.

If you replace `^` with `&&`, you are essentially saying that you always want both `a` and `b` to be teen numbers.

Neither of these are what you want. XOR, on the other hand, works for your problem perfectly.

Problem

Am doing this online exercise and one question is: We'll say that a number is "teen" if it is in the range 13..19 inclusive. Given 2 int values, return true if one or the other is teen, but not both So I should return true if one of the int values that it passes into my method is in the range of 13 and 19 but return false if both are in the range; This is the code I wrote: ``` public boolean loneTeen(int a, int b) { if ( a >= 13 && a <= 19 || b >= 13 && b <= 19 ) return true; else return false; } ``` basically if integer a is between 13 and 19 inclusive or if integer b is between 13 and 19 inclusive I return true otherwise I return false. When I test this it works except If I pass in 13 and 13 for integer a and b, I get true instead of false. My question is I've looked up the conditional "OR(||)" operator and it says that: - if the first operand determines the overall value for the condition, then the second operand is not evaluated. So when I use "Or" operator like my code above doesn't it mean if a is in the range return true or if b is in the range return true but if both are in the range return false? what is the differance between using - `if ( a >= 13 && a <= 19 || b >= 13 && b <= 19 )` and - `if ( a >= 13 && a <= 19 && b >= 13 && b <= 19 )` Why isn't it returning false if both values passed in are in the range?

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