Question

Task 2/2: Java program

Based upon the following code:

public class Main {   public static void main( String[] args ) {     String alphabet = "ABCDEFGHIJKLMNMLKJIHGFEDCBA";     for( <TODO> ; <TODO> ; <TODO> ) {       <TODO>;     } // Closing for loop   } // Closing main() } // Closing class main()

Write an appropriate loop definition and in-loop behavior to determine if the alphabet string is a palindrome or not. A palindrome is defined as a string (or more generally, a token) which has the same value when read front-to-back as back-to-front.

Answer 1

palindrome is a type of string it gives same result if we read from right or left .Therefore corresponding positions from left and right will be equal

public class Main {

public static void main( String[] args ) {

    String alphabet = "ABCDEFGHIJKLMNMLKJIHGFEDCBA";
    int len=alphabet.length(); //string length
    int flag=0;

    for( int i= 0; i<len/2 ; i++ ) { // we iterate through half of the string palindrome compare characters from left and right

      if(alphabet.charAt(i)!=alphabet.charAt(len-i-1)){
          flag=1;                               // set flag to 1 if not a palindrome and break the loop
          break;
      }

    } // Closing for loop
    if(flag==0){ // if flag unchanged then its a palindrome
        System.out.println("given string is a palindrome");
    }
    else{
        System.out.println("given string is not a palindrome");
    }

} // Closing main()

} // Closing class main()