Embarrassing Array Question

Using Arduino Programming Questions
1

G'day all,

I'm embarrassed to have to ask such an elementary question on this forum, but I can't find an answer that suits what I'm trying to do.

I have 2 arrays defined like this :

byte displayDigitsBank1[] = {char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space};
byte displayDigitsBank2[] = {char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space};

From there, based on which bank is selected, I'm trying to assign one of those arrays to a new array variable, like this :

 if(bankNumber==1)
    {
       byte displayDigits[]=displayDigitsBank1[];
    }
///...else if bankNumber==2 etc etc

Any help to get me past this would be most appreciated.

Cheers...

2

You want to copy the entire array? Why not just make the digitsBank point to digitsBank1 and skip the copying step?

3

Delta_G:
You want to copy the entire array? Why not just make the digitsBank point to digitsBank1 and skip the copying step?

Thanks for your quick replay Delta - that sounds like just what I'm after. Could you show me an example of how to do that?

4

Hi,
in C you can't copy entire arrays in a single step. You have to use a loop instead and copy every singly entry. The better idea is to use a pointer and just point to the array you want to display:

byte displayDigitsBank1[] = {char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space};
byte displayDigitsBank2[] = {char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space,char_space};
byte *displayDigits; // <--- The Pointer

if(bankNumber == 1)
    displayDigits = &displayDigitsBank1[0];
else if(bankNumber == 2)
    displayDigits = &displayDigitsBank2[0];

Afterwards you can use the pointer just like an array:

byte exampleByte = displayDigits[0];
5

in C you can't copy entire arrays in a single step.

True, but if you wrap them in a structure, magic happens.
Not that the OP needs this.

6

Thanks all, problem resolved, using the pointer.