🔒 Locked

Strange operator

Started by Teric Jun 7, 2002 at 1:08 PM 5 replies 200+ views

Original Post

Jun 7, 2002 at 1:08 PM

I was reading some code on a website, and I came across a strange operator: int a=!! (b+c) Has anyone seen this !! operator before? Is it simply a double ''not'' operator? How does it work? Let''s assume that b is 5 and c is 11, what would a be in the expression above? Thanks in advance!

Chem0sh

Jun 7, 2002 at 1:10 PM

Hmmm...never seen that before. If it is just a double negation, they would just cancel each other out.

My best guess, it''s a typo.

/*=========================================*/
/* Chem0sh */
/* Lead Software Engineer & Tech Support */
/* http://www.eFaces.biz */
/*=========================================*/

IndirectX

Jun 7, 2002 at 1:14 PM

It''s a double negation, except it evaluates to true or false. So for 5 and 6, the result will be true or 1 if converted to an integer.

Teric

Jun 7, 2002 at 1:20 PM

Thanks for the quick responses!

cgoat

Jun 7, 2002 at 1:29 PM

Another way to do the same thing (helps to understand what''s happening):


int a = (b+c)?1:0;

So if b+c is 0, "a" gets 0, otherwise "a" gets set to 1.

Chem0sh

Jun 7, 2002 at 3:34 PM

Hmm...I think that''s the first time I''ve actually seen the ternary operator actually make something easier to understand.

/*=========================================*/
/* Chem0sh */
/* Lead Software Engineer & Tech Support */
/* http://www.eFaces.biz */
/*=========================================*/

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.