Question

I am trying to display whenever I need to do a certain action in my for loop every 300th iteration (makes sense?)

Here is in code what I want to do, but not the way I want to do it:

for I := 0 to 2000 do
  Begin
   if I = 300 then
   DoAnAction;

   if I = 600 then
   DoAnAction

   if I = 900 then
   DoAnAction

   if I = 1200 ......... Same action all over, but I don't want to check all those conditions!
  End;

So I have been told to use the mod operator, and this is how I do it:

for I := 0 to 2000 do
 Begin
  if I mod 300 = 299 then
  DoAnAction;
 End;

However, the results using the above snippet would do the action at 299, 599, 899 ….

How can I make it do it at 300, 600, 900 …… using the Mod operator? (And doing if I mod 300 = 300 did not work)

Thanks!

Answer 1

for I := 0 to 2000 do
 Begin
  if (I mod 300 = 0) and (I > 0) then
    DoAnAction;
 End;

Though your previous version does makes sense too, I=299 is the 300th pass 😉

EDIT: I mod 300 = 300 would not work because mod operator returns the remainder of devision, which is by definition will be in range 0..299