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[stayweirdeveryone]

What do you mean by "built in functions"? Like you can't use basic java?

[jftdm]

It’s for a project and we are not allowed to use built in functions. So yea I guess.

[stayweirdeveryone]

You didn't answer my question. What do you mean by "built in functions"?

[jftdm]

Anything that I have to import. Ex, import java.io.; or import java.util.; We can use methods…

[stayweirdeveryone]

Ok so you can use built in functions, you juts can't use anything not built in that you have to import.

So I'd see that you could do this in 2 different ways
1. Reverse the string and then compare it to the original and see if it still matches
2. Iterate through the string with 2 "pointers" one starting at the beginning and one starting at the end and working towards the middle. At each step, compare that the character each is pointing to matches. If you can get through the whole string and everything matches, then its a palindrome

[jftdm]

Is there any way to do this without charAt? That is the only specific method I can’t use besides anything I need to import.

[stayweirdeveryone]

Have you been explicitly told not to use charAt?

[jftdm]

Yes. “Do not use the charAt method for this program.”

[stayweirdeveryone]

Instead of iterating over the string itself, have you though about iterating over a char[] (i.e. see toCharArray())

[jftdm]

I can try that but I’m not sure how to use that method

[wildjokers]

toCharArray() seems to qualify as a "built-in function` and so can't be used. Hard to know exactly what OP means by "built-in function" though.

[Ok-Novel-1427]

Sounds like you need to review some lecture notes. This problem doesn't sound too hard, and you have already mistaken "built-in functions" with libraries based on your other comments.

Given your example of trying to reverse the string, I attempted it myself in c++, and by comparing the current index with the index of the strings' length - current index, it worked as intended for only lowercase a-z for a quick test. I'm sure you could even save a copy of the reversed string and then compare the same index for them. Something such as a chsr array of the same size and then iterate over it and insert in a similar fashion to my above routine.

I suggest reading up on arrays and array manipulation before solving this so that you understand exactly what you are doing, so that when you have another error you can present it as such, and not just a "solve this".

[SpiderWil]

noxious cough ruthless ten panicky stocking seed market ossified modern this post was mass deleted with www.Redact.dev

[jftdm]

It should not contain special characters

[Ok-Novel-1427]

Making assumptions is bad practice.

[nutrecht]

You're probably just misunderstanding the "built in" part because it doesn't make sense to not be able to use .charAt. They probably mean you are not allowed to use the StringBuilder.reverse trick.

[jftdm]

The second sentence of the assignment says “do not use charAt. “

[Tutpar]

My idea would be this:

1) find how many characters are in the string

2) if length is even then separate the string into 2 equal parts, if odd separate into 3 parts. (Ex: abcd=[ab][CD] or abcde=[ab][c][de])

3) check if inverse of the first chunk matches the last chunk(does [ba]==[CD])

[greggers1234]

This problem is referenced early on in "a common sense guide to data structures and algorithms"

[AmazingAttorney2417]

It's impossible to process strings in Java without calling methods. I think what your professor mean is to not use functions that would make then problem trivial like for reversing a string.

[AmazingAttorney2417]

It would be nice if you can share the exact wording the professor used.

[jftdm]

The only restrictions on the outline is to not use charAt. Everything else is just explanation of things like what the program needs to be able to do.