Mathematical expression 1 + + 1 RETURNs 2

Question

Mathematical Expression

can anybody know the reason of this. because I only know ++ -- operation but in this case the operator is '+ +' and still not giving an error.

@niklasB yes I know unary operator and I got my answer too. Thanks — Ashish Aggarwal, May 19 '14 at 12:18

score 14 · Accepted Answer · answered May 19 '14 at 12:12

14

Its because + is also a unary operator which means positive, just like - means negative.

1 + + 1 =   1 + (+1)  = 1 + 1  = 2
1 + - 1 =   1 + (-1)  = 1 - 1  = 0
1 + - + 1 = 1 + -(+1) = 1 + -1 = 1 - 1 = 0;

answered May 19 '14 at 12:12

Peter Lawrey

@Kent Wait until the "verify you're a human" pop up will appear sometime for you :_( – Maroun May 19 '14 at 12:14
@MarounMaroun my experience tells that this "verification" comes often if only code block was written in answer – Kent May 19 '14 at 12:16
@Kent Sometimes you want to be fast and enter details later as edit. – Maroun May 19 '14 at 12:16
@MarounMaroun oh, I got you! :-) – Kent May 19 '14 at 12:17
@Kent This prevents my cat from posting answers :D – Maroun May 19 '14 at 12:17
@PeterLawrey I really.. really.. didn't expect that. LOL – Maroun May 19 '14 at 12:21
1

@MarounMaroun It has the funniest error handling `O NOES ...` and finishes with `KTHXBYE` – Peter Lawrey May 19 '14 at 12:24

Anirudh Ramanathan · Answer 2 · 2014-05-19T12:23:21.567

7

Unary + and - operators at work here.

1 + (+1) = 2
1 + (-1) = 0
1 + (-(+1)) = 0

edited May 19 '14 at 12:23

answered May 19 '14 at 12:13

See also: http://stackoverflow.com/questions/2624410/what-is-the-purpose-of-javas-unary-plus-operator – slim May 19 '14 at 12:15

2 Answers2