MoneyToWords.java

package ms;

public class MoneyToWords {

    public static final String[] units = { "", "One", "Two", "Three", "Four",
            "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve",
            "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen",
            "Eighteen", "Nineteen" };

    public static final String[] tens = { 
            "",         // 0
            "",      // 1
            "Twenty",   // 2
            "Thirty",   // 3
            "Forty",    // 4
            "Fifty",    // 5
            "Sixty",    // 6
            "Seventy",  // 7
            "Eighty",   // 8
            "Ninety"    // 9
    };
    public static String convert(int n) {
        
        if(n<0) return "Minus" + convert(-n);
        if(n<20) return units[n];
        if(n<100) return tens[n/10]+" "+units[n%10];
        if(n<1000) return units[n/100]+" hundred"+ (n%100>0?" and "+convert(n%100):"");
        if(n<100000) return units[n/1000]+" thousand"+ (n%1000>0?" and "+convert(n%1000):"");
        if(n<10000000) return units[n/1000000]+" million"+ (n%1000000>0?" and "+convert(n%1000000):"");
        
        return "Sorry, the number is too big for me right now, I am only 5 years old, you know";
    }
    
    public static void main(String[] args) {
//        System.out.println(0+"--"+convert(0));
//        System.out.println(1+"--"+convert(1));
//        System.out.println(10+"--"+convert(10));
//        System.out.println(20+"--"+convert(20));
//        System.out.println(21+"--"+convert(21));
//        System.out.println(1000+"--"+convert(1000));
//        System.out.println(9999+"--"+convert(9999));
//        System.out.println(9000000+"--"+convert(9000000));
        System.out.println(9999999+"--"+convert(9999999));
        
        
        
    }
}