Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Objective-C Basics (Retired) Pointers and Memory Pointer Power

Auto increment syntax

In Douglas Turner's Arrays, Length and Size video, he auto increments the variable 'letter' like this: ++letter. Is that the same as letter++? Must the ++ be in front of the the variable name?

1 Answer

Stone Preston
Stone Preston
42,016 Points

they are not the same

++variable means that the variable is incremented by one and the new value is returned. variable++ means that the variable is incremented by one and the old value is returned:

int i = 5;
i = ++i; // i is incremented and new value is returned. now i = 6

int j = 5;
i = j++; // i is now 5. the value of j before the increment is returned and then j is incremented after the assignment so j is now 6

Thanks, Stone. Got it.