/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

package numtonames;
import java.util.Scanner;
/**
*
* @author Mohd Redzuan Omar
*/
public class NumToNames {

       static final String[] number1 ={"","Hundred"};
       static final String[] number2 ={ "zero", "one", "two", "three", "four", "five", "six"
                , "seven", "eight", "nine", "ten"};
  
    
    
     public static String numToNames(int n)
    {
       String str;
       if(n %100 < 10)
       {
          str = number2[n % 100];
          n/=100;//n=n/100
       }
       else
       {
            str = number2[n % 5];
            n/=5; //n=n/5
       }
        if(n == 0) return str;
        return number2[n] + " hundred " + str;
        
        
        
    }
    
    public String convert(int number)
    {
        if(number == 0)
        {
            return "zero";
            
        }
        
        String pra = "";
        String str1 = "";
        
        int i = 0;
        do{
            int n = number % 100;//example if 372%100 =72
            if(n!=0)// if n bukan 0
            {
                String s = numToNames(n);//call method numToNames
                str1 = s + number1[i] + str1;
            }
            i++;//increase i by 1
            number = number / 100;
        }while(number > 0);
        return (pra+str1).trim();//trim (edit space)
    }

    public static void main(String[] args) {
        NumToNames number = new NumToNames();
        Scanner scanner = new Scanner (System.in);
        System.out.println("Enter a positive integer: ");
        int num = scanner.nextInt();
        
        if(num > 0)
        {
            
            System.out.println(number.convert(num));
        }
        else if(num < 0)
        {
            System.out.println("Invalid number, try again");
        }
    }

}

        //the entered number
        int i = 63546;
        String str = Integer.toString(i);
        char[] c = str.toCharArray();
        for (int j = 0; j <= c.length - 1; j++) {
            int a = Integer.parseInt(Character.toString(c[j]));
            switch (a) {
            case 1:
                System.out.print("One ");
                break;
            case 2:
                System.out.print("Two ");
                break;
            case 3:
                System.out.print("Three ");
                break;
            case 4:
                System.out.print("Four ");
                break;
            case 5:
                System.out.print("Five ");
                break;
            case 6:
                System.out.print("Six ");
                break;
            case 7:
                System.out.print("Seven ");
                break;
            case 8:
                System.out.print("Eight ");
                break;
            case 9:
                System.out.print("Nine ");
                break;
            case 0:
                System.out.print("Zero ");
                break;

            }
        }
    }

package palindromes;
import java.util.Scanner;
/**
*
* @author Mohd Redzuan Omar
*/
public class CheckPalindrome {

    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter a string: ");
        String str = scanner.next();
        if(isPal(str))
        {
            System.out.println( str + " is a palindrome");
        }
        else
            System.out.println( str + " is not a palindrome");
    }
    public static boolean isPal(String s)
    {
        return isPal(s,0,s.length()-1);
    }
    public static boolean isPal(String str, int startIndex, int endIndex)
    {
        
        
        if(endIndex <= startIndex )
        {
            
        }
        else if(str.charAt(startIndex) != str.charAt(endIndex))
        {
            return false;
            
        }
        else
        return isPal(str,startIndex+1,endIndex-1);
        return true;
      
    }
}

package palindromes;
import java.util.Scanner;
/**
*
* @author Mohd Redzuan Omar
*/
public class CheckPalindromes {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] str = new String[5];
        int i;
        System.out.println("Enter a string: ");
        for( i=0; i<str.length;i++)
        {  
            str[i]=scanner.next();
            if(isPal(str[i]))
            {
                System.out.println( str[i] + " is a palindrome\n");
            }
            else
            System.out.println( str[i] + " is not a palindrome\n");
        }
        
        
    }
    public static boolean isPal(String s)
    {
        return isPal(s,0,s.length()-1);
    }
    public static boolean isPal(String str, int startIndex, int endIndex)
    {
        
        
        if(endIndex <= startIndex )
        {
            
        }
        else if(str.charAt(startIndex) != str.charAt(endIndex))
        {
            return false;
            
        }
        else
        return isPal(str,startIndex+1,endIndex-1);
        return true;
      
    }

}

       switch(digit)  
          {  
              case 0: str.concat("Zero ");  
                         break;  
              case 1: str.concat("One ");  
                         break;  
              case 2: str.concat("Two ");  
                         break;  
              case 3: str.concat("Three ");  
                         break;  
              case 4: str.concat("Four ");  
                         break;  
              case 5: str.concat("Five ");  
                         break;  
              case 6: str.concat("Six ");  
                         break;  
              case 7: str.concat("Seven ");  
                         break;  
              case 8: str.concat("Eight ");  
                         break;  
              case 9: str.concat("Nine ");  
                         break;  
          }  

final String[] strDigit = {"Zero", "One", "Two", "Three",....};

str.concat(strDigit[digit]);