Already answered,

code removed for privacy reasons.

Thanks!

Instead of

if(isPalindrome = false)

Change it to

if(isPalindrome == false)

because "=" means you assign the value to the variable while "==" means comparing the value with the variable. However You could do

if(!isPalindrome)

because it is a boolean and you could use it right away as "true" or "false" (or !false is true and vice versa)...

PS: You may have argument mismatch exception in your retrieveInput() method if a user enter something which is not all digit number...

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