In java , what is the form to inverse a character chain?

Question

I used for (int i = arr.length; i>0;i--){} it don't do anything

Answer 1

You're fine, just keep practicing and you'll get it right

Answer 2

Well you have an empty loop body there. Why aren't you printing the characters using the index <i>?

And remember arrays have zero-based indices, so an array of 10 elements allows 0 ~ 9 as valid index. I suggest you to try like this ...

for( int i = arr.length - 1; i >= 0; i-- )
{
System.out.print( arr[ i ] );
}

Initialize <i> with arr.length - 1
Cause if array's length was 10, the last index we could refer to would be the 9th.

And for the loop condition, continue loop while <i> >= 0 cause you'd want to also print the first character (stored at index 0).

Answer 3

Thanks Ipang it was that I was very confused about there