acessing a 1D array with row/col

imagePtr[i*cols + j]
where i and j are the row/col coordinates. this isn't right, i can't remember how else to do it. i know it's something LIKE this, just not exactly what, and google isn't cooperating. do i need to use the memory locations?

>>32
what's wrong with it? the casting? it may be unnecessary, but is it not proper programming practice to do it anyway? go fuck yourself, this is the kind of stupid elitist circlejerking that i've come to expect from /prog/.