C-style loops vs Perl loops (in Perl) -

I think there is something that I do not get about Pearl's looping system.

It was my understanding that for <$ p>

  my $ j (0 .. $ # arr) {...}  

Functionally equivalent to:

 for  (my $ i = 0; $ i & lt; = $ # arr; $ i ++) {..}  

However, my code seems to have some minor differences in their work. Specifically, the time in which they decide when to end. For example:

Suppose @arr has started with a variable in it.

Should both these blocks fix the same thing?

  For my $ i (0 .. $ # arr) {if (some conditions that come true) {push (@arr, $ value); }} For  

and

  (my $ i = 0; $ i & lt; = $ # arr; $ i ++) {if (Some conditions may be true) {push (@arr, $ value); }}  

Although in execution, although a new value is pushed into both positions, the first loop will be closed only after one recurrence.

Should this happen? If so, why?

Edit: Thank you for all your replies, I know that I can fulfill the same thing with other looping mechanisms. When I asked if there is another syntax, I was specifically talking about using it for it. Obviously there is not. As for who I want Syntax already achieved with C style I was only asking because I was asked to avoid C style but I still like to loop.

$ i & lt; = $ # Arr is evaluated before each loop, whereas (0 .. $ # arr) is evaluated once before any loop.

In this way, the first code @arr .