ROBOTC.net forums - View topic - element access for arrays not working with paranthesis

View unanswered posts | View active topics

It is currently Fri Apr 18, 2014 10:31 am

element access for arrays not working with paranthesis

Moderators: mightor, starwarslegokid, miki

Page 1 of 1

[ 3 posts ]

Print view

Previous topic | Next topic

element access for arrays not working with paranthesis

Author

Message

felix-freiberger

Rookie

Joined: Sat Dec 04, 2010 10:32 am
Posts: 13

element access for arrays not working with paranthesis

Hi,

in RobotC 3.6, this code compiles:


	Code: task main() { string test[] = {"entry1", "entry2", "entry3", "another one", "final one"}; nxtDisplayCenteredTextLine(0, "< %s >", test[2]); }

while this doesn't:


	Code: task main() { string test[] = {"entry1", "entry2", "entry3", "another one", "final one"}; nxtDisplayCenteredTextLine(0, "< %s >", (test)[2]); }

Is that a bug? How can I dereference a pointer to an array and look up an element of the array? (*testPointer)[2] won't work.

--Felix

Sun May 12, 2013 1:35 pm

mightor

Moderator

Joined: Wed Mar 05, 2008 8:14 am
Posts: 3105
Location: Rotterdam, The Netherlands

Re: element access for arrays not working with paranthesis

What exactly are you trying to achieve? The following code does exactly what it is supposed to do:


	Code: task main() { string test[] = {"entry1", "entry2", "entry3", "another one", "final one"}; for (int i = 0; i < 5; i++) { writeDebugStreamLine("< %s >", test[i]); } }

What are you looking to dereference and why? This also works quite nicely:


	Code: task main () { string test[] = {"entry1", "entry2", "entry3", "another one", "final one"}; string foo = &test; for (int i = 0; i < 5; i++) { writeDebugStreamLine("< %s >", (foo + i)); } }

_________________
| Professional Conduit of Reasonableness
| (Title bestowed upon on the 8th day of November, 2013)
| My Blog: I'd Rather Be Building Robots
| ROBOTC 3rd Party Driver Suite: [Project Page]

Sun May 12, 2013 4:17 pm

felix-freiberger

Rookie

Joined: Sat Dec 04, 2010 10:32 am
Posts: 13

Re: element access for arrays not working with paranthesis

Hi,

that seems to work for me, thanks!

I was trying to do something like that:


	Code: nxtDisplayCenteredTextLine(3, "< %s >", ((menu->labels) + (selection)));

--Felix

Mon May 13, 2013 5:25 am

Page 1 of 1

[ 3 posts ]

Who is online

Users browsing this forum: No registered users and 2 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to: