Debugger Exception Error and memory overshoot

Question

I tried to run the following code but it shows an error regarding memory address and shows a message that \'n maybe undefined after the loop\'. Please have a look.

Answer 1

You don't allocate any memory for the arrays. You need to call to SetLength to do that.

SetLength(r, n_max);
// and likewise for the other arrays

What's more, the loop does nothing. The loop contains a single statement which is an empty statement terminated by the semi-colon after the do.

for n := 0 to n_max-1 do;
// yes, that semi-colon is the end of the loop

You'll need a begin/end block.

for n := 0 to n_max-1 do
begin
  // loop body goes in here
  ....
end;
// at this point, outside the loop, the value of n is ill-defined.