pointer array?

Projects Programming
1

Hi gang-

I have a question on using arrays.

normal usage:

byte buttons[] = {5, 6, 3, 9};

can it be done like this instead:

const int safetyPin = 5;
const int normalPin = 6;
const int autoPin = 3;
const int reloadPin = 9;

byte buttons[] = {safetyPin, normalPIn, autoPin, reloadPin};

I guess an arrays of variables? or references to pin(s)?
this way I can also refer to them by pin name else where..etc..

Thanks

2

Yes

int *i_Array[] = { &safetyPin, &normalPIn, &autoPin, &reloadPin};

notice the int pointer type, not a byte, declare the constants as bytes to use byte*
EDIT: this will use more ram than your first method.

3

xl97:
can it be done like this instead:

const int safetyPin =  5;

const int normalPin = 6;
const int autoPin =  3;
const int reloadPin =  9;

byte buttons[] = {safetyPin, normalPIn, autoPin, reloadPin};

Try it and see? Apart from the typo on normalPIn, that compiles and should work.

4

Even this, since you are using constants:

const byte buttons[] = {safetyPin, normalPin, autoPin, reloadPin};
6

The OP did not say anything about pointers.

7

Ah, except the thread title of course.

My response was to the actual post, I ignored the thread title.

8

xl97:
Hi gang-

I have a question on using arrays.

normal usage:

byte buttons[] = {5, 6, 3, 9};

can it be done like this instead:

const int safetyPin = 5;
const int normalPin = 6;
const int autoPin = 3;
const int reloadPin = 9;

byte buttons[] = {safetyPin, normalPIn, autoPin, reloadPin};

I guess an arrays of variables? or references to pin(s)?
this way I can also refer to them by pin name else where..etc..

Thanks

Learn about enumerators (enum), they can also help you keep your code straighter.

9

thanks guys..

whre can I learn about: (enum)?

I didnt see it listed here: Arduino - Home

Am I allowed to use any "C" code or something?

I found this:
http://arduino.cc/playground/Code/Enum

but how to use it and why didnt really click yet.. =(

11

Your intention could be expressed using enums something like this:

enum MY_PIN_SET{
  safetyPin =  5,
  normalPin = 6,
  autoPin =  3,
  reloadPin =  9,
};

const byte buttons[] = {safetyPin, normalPin, autoPin, reloadPin};