Assigning values to multidimensional arrays.

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hi there !
I am new to Arduino programming.
I came across a small problem while trying to assign values to a multi dimensional array.

Definition looks like this.
int MyArray[11][3];

Now to my problem.
To save code I would like to do something like this
MyArray [1][0] = 10,20,30;

But in this case only the first value "10" is assigned to the array.
MyArray [1][1] and MyArray [1][2] is 0.

If I do like this it works
MyArray [1][0] = 10;
MyArray [1][1] = 20;
MyArray [1][2] = 30;

Is there a smarter syntax or is this the only way?

/E.T

2

If you want to initialise the array when you declare it, yes, there is a smarter way:

int MyArray[11][3] = 
{
  {10, 20, 30},
  {// more values here},
  // and so on.
};

"MyArray [1][0] = 10,20,30;"
Won't work, because 'C' evaluates the statment left-to-right, so the 10 is assigned, 20 and 30 are evaluated to be true, but the result is discarded.

3

Hello and thank you for answering.
Perhaps I was not clear enough.

I would like to update the array like in your example
during runtime but I can not make it work.

/E.T

4

I can not make it work.

It won't work the way you wrote it first.
You have to write it out in full.

5

You can only assign one element at a time.

myArray[1][0] = 10;
myArray[1][1] = 20;
myArray[1][2] = 30;

You could do these things in a loop, if the right-hand side can be calculated.

for (int i = 0; i < 3; i++)
    myArray[1][i] = (i+1)*10;