What does the '?" mean in this line

Projects Programming
1

Can someone please tell me what the ? does (i.e. mean) in this line of code?

int incColour = decColour == 2 ? 0 : decColour + 1;

Thanking you in advance of your answer.

2

It's called the "ternary" operator.

Essentially it's equivalent to:

int incColour;
if (decColour == 2) incColour = 0; else incColour = decColour + 1;

EDIT: Please ignore the following brain fart of mine.
Which BTW could be more simple stated as:
int incColour = (decColour == 2) ? 0 : 3;

4

Delta_G:
any other number you add one. 3 would therefore never be an option.

Whoops, that was silly mistake there. :o Of course you are correct. :slight_smile:

5

Read this:

http://www.cplusplus.com/doc/tutorial/operators/.

6

Sciencez:
Can someone please tell me what the ? does (i.e. mean) in this line of code?

int incColour = decColour == 2 ? 0 : decColour + 1;

Thanking you in advance of your answer.

Look at it this way:

ANSWER = (YESNO) ? YES : NO;

That is, if "YESNO" is true, then "ANSWER" is set to "YES". If "YESNO" is false, than "ANSWER" is set to "NO".

Look a different way:

ANSWER = TRUE ? YES : NO (answer will be set to "YES")

ANSWER = FALSE ? YES : NO (answer will be set to "NO")

ANSWER = (1) ? YES : NO (answer gets set to "YES" because "1" is true)

ANSWER = (0) ? YES : NO (answer gets set to "NO" because "0" is false).

Hope this helps.