Enroll in CS60 at Harvard Extension School to Study Programming


package com.harvard.cs60;

import java.util.Scanner;

public class Palindrome {

public static void main(String[] args) {

System.out.println(“Enter a string to check if it is a palindrome:”);

Scanner scanner = new Scanner(System.in);

String inputString = scanner.nextLine();

if (isPalindrome(inputString)) {

System.out.println(“The input String is a palindrome.”);

} else {

System.out.println(“The input String is not a palindrome.”);

}

}

public static boolean isPalindrome(String inputString) {

int length = inputString.length(); // find the length of the input string int i, begin, end, middle; // declare that you are going to use these variables in the following code

begin = 0; // start at the beginning of the string, index 0

end = length – 1; // set end to be just before the end of the string by doing length – 1 (0 based counting)

middle = (begin +

import java.util.*;

import java.util.Scanner;

public class PalindromeChecker {

public static void main(String[] args) {

System.out.println(“Enter a string to check if it is a palindrome: “);

Scanner scanner = new Scanner(System.in);

String inputString = scanner.nextLine();

String reverse = reverseString(inputString);

// Checking whether the string is palindrome or not

if (inputString.equals(reverse)) {

System.out.println(“The input string is a palindrome.”);

} else {

System.out.println(“The input string is not a palindrome.”);

}

}

// Method to reverse any string

public static String reverseString(String input) {

char[] inp = input.toCharArray();

for (int i = 0; i < inp.length / 2; i++) { char temp = inp[i]; inp[i] = inp[inp.length - 1 - i]; in public class Palindrome { public static void main(String[] args) { String str, rev = ""; Scanner in = new Scanner(System.in); System.out.println("Enter a string to check if it is a palindrome"); str = in.nextLine(); int length = str.length(); for ( int i = length - 1; i >= 0; i– )

rev = rev + str.charAt(i);

if (str.equals(rev))

System.out.println(“Entered string is a palindrome.”);

else

System.out.println(“Entered string is not a palindrome.”);

} }

The following program is a program that determines if a word is a palindrome. It is important to be able to identify a palindrome to avoid grammatical errors in writing.

The word “palindrome” was coined from Greek roots palin (πάλιν; “again”) and dromos (δρóμος; “way, direction”), by English writer Ben Jonson in the 17th century. The word “palindrome” first appeared in English in the late 16th century and has been used primarily as an adjective. A common example of a palindrome is the word racecar, which reads the same forward or backward, although backwards it spells racecar.

The following program uses a while loop and an array to determine if a word is a palindrome. It shows how efficient arrays are because they are able to store information without having to use variables for each character of the string.

public class Palindrome {

public static void main(String [] args) {

for (int i = 0; i < args.length; i++) { String s = args[i]; System.out.println(s + " is palindrome? " + isPalindrome(s)); } } public static boolean isPalindrome(String s) { if (s == null || s.length() <= 1) return true; if (s.charAt(0) != s.charAt(s.length()-1)) return false; return isPalindrome(s.substring(1, s.length() - 1)); } } //Palindrome.java import java.util.*; import java.io.*; public class Palindrome { public static void main(String[] args) throws Exception { //for time test: long start = System.currentTimeMillis(); BufferedReader input = new BufferedReader(new InputStreamReader(System.in)); ArrayList palindromes = new ArrayList();

for (;;) { //loop forever…or until the user enters an empty line.

System.out.print(“Please enter a word or phrase (enter blank line to quit): “);

String line = input.readLine().trim(); //get rid of leading and trailing whitespace on the line

if (line.equals(“”)) break; //if they entered a blank line, exit the loop

String s = getLetters(line).toLowerCase();

if (isPalindrome(s)) {

palindromes.add(“\”” + line + “\” IS a palindrome”);

} else {

palindromes.add(“\”

import java.util.Scanner;

public class Palindrome {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

System.out.print(“Input a word:”);

String str = in.nextLine();

System.out.println(“The word ‘” + str + “‘ is a palindrome: ” + isPalindrome(str));

}

public static boolean isPalindrome(String s) {

if (s == null || s.isEmpty()) {

return true;

}

int i = 0, j = s.length() – 1;

while (i < j) { if (s.charAt(i) != s.charAt(j)) { return false; } i++; j--; } return true; } }


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