Changing arrays

Using Arduino Programming Questions
1

OK, so I have 3 arrays of 10 values. I wish to be able to change through these arrays with the press of a button, but I'm having trouble changing the arrays.

I have in my code, the variable "currarray", which is the current array. I also have 3 other arrays, array1[10], array2[10] and array3[10]

Somehow, I need to put any of those 3 arrays, into currarray?

For example, I tried:

byte currarray[] = array1[];

However, I get error messages.

I also tried byte currarray = array1;

Still didn't work.

A snippet of my code:

byte array1[10] = {36, 41, 43, 44, 46, 48, 49, 51, 53, 55}; 
byte array2[10] = {35, 47, 54, 55, 57, 59, 60, 61, 62, 64}; 
byte array3[10] = {48, 60, 62, 63, 65, 67, 69, 70, 72, 74}; 

         if (digitalRead(BUTTON_1) == LOW){
           if (currarray[] == array1[]){
             currarray[] = array2[];
             digitalWrite(18, HIGH);
             digitalWrite(17, LOW);
             digitalWrite(19, LOW);
           }
           if (currarray[] == array2[]){
             currarray[] = array3[];
             digitalWrite(19, HIGH);
             digitalWrite(18, LOW);
             digitalWrite(17, LOW);
           }
           if (currarray[] == array3[]){
             currarray[] = array1[];
             digitalWrite(19, LOW);
             digitalWrite(18, LOW);
             digitalWrite(17, HIGH);
           }
   }

How would I go about doing this?

Regards

2

Make a multidimensional array of it

#define BUTTON_1  4

byte array[3][10] = {
  {36, 41, 43, 44, 46, 48, 49, 51, 53, 55},
  {35, 47, 54, 55, 57, 59, 60, 61, 62, 64},
  {48, 60, 62, 63, 65, 67, 69, 70, 72, 74}
};

int arrayselector= 0;  // may also be called differently but meaningfull var names helps to understand code.

void setup()
{
  Serial.begin(115200);
}

void loop()
{
if (digitalRead(BUTTON_1) == LOW) 
  {
    arrayselector= (arrayselector+ 1) %3;  // changes from 0->1->2->0
  }

  Serial.println(array[arrayselector][4]);
  delay(1000);
}

The button just changes the arrayselector from 0->1->2->0

3

Thanks, that is exactly what I was wanting :wink:

Regards,
Dan

4

one way would have been to use a for loop.
e.g.

for (int i=0; i<10; i++) {
array1[i] = currarray[i];
}

if you wanted to be able to switch between arrays u could make 3 different for loops and use switch case.
But i think you could use pointers to not to sure on how maybe somebody here knows

5

Use a pointer.

byte* currarray;
array1[10] = {1,2,3,...}
array2[10] = {11,12,13,...}

currarray = array1; //now currarray points to array1 and currarray[n] = array1[n]

....some code....

currarray = array2; //now currarray points to array2 and currarray[n] = array2[n]

6

Use a pointer.

byte* currarray;
byte array1[10] = {1,2,3,...}
byte array2[10] = {11,12,13,...}