Select the appropriate code which tests for a palindrome.

Question

a)

public static void main(String[] args) 
{
 System.out.print("Enter any string:");
        Scanner in=new Scanner(System.in);
        String input = in.nextLine();
        Stack<Character> stk = new Stack<Character>();
 for (int i = 0; i < input.length(); i++) 
 {
            stk.push(input.charAt(i));
        }
 String reverse = "";
 while (!stk.isEmpty())
 {
            reverse = reverse + stk.pop();
        }
 if (input.equals(reverse))
        System.out.println("palindrome");
        else
        System.out.println("not a palindrome");
}

b)

public static void main(String[] args) 
{
 System.out.print("Enter any string:");
        Scanner in=new Scanner(System.in);
        String input = in.nextLine();
        Stack<Character> stk = new Stack<Character>();
 for (int i = 0; i < input.length(); i++) 
 {
            stk.push(input.charAt(i));
        }
 String reverse = "";
 while (!stk.isEmpty())
 {
            reverse = reverse + stk.peek();
        }
 if (input.equals(reverse))
        System.out.println("palindrome");
        else
            System.out.println("not a palindrome");
}

c)

public static void main(String[] args) 
{
 System.out.print("Enter any string:");
        Scanner in=new Scanner(System.in);
        String input = in.nextLine();
        Stack<Character> stk = new Stack<Character>();
 for (int i = 0; i < input.length(); i++) 
 {
            stk.push(input.charAt(i));
        }
 String reverse = "";
 while (!stk.isEmpty())
 {
            reverse = reverse + stk.pop();
   stk.pop();
        }
 if (input.equals(reverse))
        System.out.println("palindrome");
        else
            System.out.println("not a palindrome");
}

d) None of the mentioned

Posted under Stacks and Queues Data Structures and Algorithms

Answer: (a).a

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Q. Select the appropriate code which tests for a palindrome.

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Q. Select the appropriate code which tests for a palindrome.

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