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A palindrome is word or phrase that reads the same forward and backward, ignoring blanks and considering uppercase and lowercase versions of the same letter to be equal. For example, the following are palindromes:
Warts n straw
Able was I ere I saw Elba
Le sac a sel (this one is mine: the bag of salt)
Write a program that will accept a sequence of characters terminated by a period and will decide whether the string—without the period—is palindrome. You may assume that the input contains only letters and blanks and is at most 80 characters long. Include a loop that allows the user to check additional strings until she or he requests that the program end. (Hint: Define a static method called isPalindrome that begins as follows:
Public static Boolean isPalindrome(char a, int used)
Your program should read the input characters into an array whose base type is char and then call the preceding method. The int variable used keeps track of how much of the array is used, as described in the section entitled “Partially Filled Arrays.”