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(x*# of columns) + y

Assumptions:

1. x represents the columns and y represents the rows.
2. Maximum number of columns: x_len.
3. Numbering of rows and columns begins with 1.

Then,

1_D_index(x,y) = (y-1) * x_len + x [if y > 1]
1_D_index(x,y) = x [otherwise]

I have been asked the same question, be careful guys, as coordinate (x,y) is represented by one bit and in C, minimum that we have is character array. So you need to convert your position to correct array element first and then you have to apply bit wise operation to set the correct bit

int c[10][10];

int *p;

p = *c;

*(p + ( ( x * screenwidth ) + y ) ) = 1;

How will do the bit wise operation once you have the correct array position.

I think this is how it will be done

position in 1_D array = (x*no of columns)+y which is let say 'pos'.
and then you just have to do arr[pos] = 1<<0.