One dimensional array

[morando]

I have to use one dimensional array as 2d matrix of some values.
The problem is that i need to check if given index is out of bounds on the right side (column) border.
Since i can come up with solution i have tried google but none of the answers is to be found.

Thank you for your time.

[MiiNiPaa]

Wait. You have both max X size and max Y size (for subscript transition between 2D<=>1D)
What problem do you have?

[SirSmilesaLot]

wat is ur criteria for assigning memory for 2d array ??? if that is clear then ur problem is solved.

[morando]

I have a 7x7 matrix which of inner 5x5 fields are "valid", i need to check if some given index is out of that bounds (specially on the right side column).


Am i clear now? Sorry for bad enlish.

Thank you for your time.

[SirSmilesaLot]

do u know the col no of element u are checking?

[MiiNiPaa]

if (x > 0 && x < 6 && y > 0 && y < 6)?

[morando]

do u know the col no of element u are checking?

Yes, rightmost column.

@MiiNiPaa
I know that but i need to check only the rightmost column.
Please don't ask why. :D

[SirSmilesaLot]

//looping of 2D array
if(y == 6)
//ur action 

[morando]

But looping thru 1D array (as 2D), touching only rightmost column. I have that limitation, otherwise it would be easy.

[MiiNiPaa]

If you are using 1D array as 2D, you have some way to map 2D coordinates to 1D, right?

[morando]

I think this is it?

for (i = 0; i < 7; ++i)
    //for (j = 7; j < 7; ++j)
    j = 6;
    inx = i * 6 + j;
    array[inx]

If it is i am uber stupid.

[MiiNiPaa]

    j = 6;
    inx = i * 6 + j;

Either i * 7 (if valid indexes is 0..6) or j = 5 (if they are 0..5)

[morando]

Thank you all.