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element access for arrays not working with paranthesis

Moderators: mightor, starwarslegokid, miki

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element access for arrays not working with paranthesis

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felix-freiberger

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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

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Joined: Wed Mar 05, 2008 8:14 am
Posts: 3162
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)); } }

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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

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