NumberToWord.java

/*

take 1 2 3 4------1thousand two hundread thitry four
limit 10 lakh
*/
public class NumberToWord{
    public String numLetters(char ch){
        
        if(ch=='1'){
            return "one";
        }else if(ch=='2'){
            return "two";

        }
        else if(ch=='3'){
            return "three";
            
        }else if(ch=='4'){
            return "four";
            
        }else if(ch=='5'){
            return "five";
            
        }else if(ch=='6'){
            return "six";
            
        }else if(ch=='7'){
            return "seven";
            
        }else if(ch=='8'){
            return "eight";
            
        }else if(ch=='9'){
            return "nine";
            
        }
        return "";
    }
    public String DigitToWord(String n){
        String prefix="";
        String suffix="";
        if(n.length()==2){
            if(n.charAt(0)=='0' && (n.charAt(1)>'0' && n.charAt(1)<'9')){
                prefix="";
                suffix=numLetters(n.charAt(1));
            }
            else if(n.charAt(0)=='1'){
                prefix=numLetters(n.charAt(1));
                suffix="teen";
            }else if(n.charAt(0)=='2'){
                prefix="twenty";
                suffix=numLetters(n.charAt(1));
            }
            else if(n.charAt(0)=='3'){
                prefix="thirty";
                suffix=numLetters(n.charAt(1));
            }else if(n.charAt(0)=='4'){
                prefix="fourty";
                suffix=numLetters(n.charAt(1));
            }else if(n.charAt(0)=='5'){
                prefix="fifty";
                suffix=numLetters(n.charAt(1));
            }else if(n.charAt(0)=='6'){
                prefix="sixty";
                suffix=numLetters(n.charAt(1));

            }else if(n.charAt(0)=='7'){
                prefix="seventy";
                suffix=numLetters(n.charAt(1));
            }else if(n.charAt(0)=='8'){
                prefix="eighty";
                suffix=numLetters(n.charAt(1));
            }
            else if(n.charAt(0)=='9'){
                prefix="ninety";
                suffix=numLetters(n.charAt(1));
            }

        }else if(n.length()==1){
            suffix=numLetters(n.charAt(0));
        }
        return prefix+" "+suffix;
    }
    //1 2 3
    public String getNumber(String n){

        return DigitToWord(n);
    }
    public String getWord(int i){
        if(i==6 || i==5){
            return "lakh ";
        }
        else if(i==3 || i==4){
            return " thousand ";            
        }else if(i==2){
            return "hundread ";
        }        
        return " ";
    }
    public String extractTwo(int i,String finalStr){
        String formNum="";
        if(finalStr.charAt(i)=='0' && finalStr.charAt(i-1)=='0'){}else{
        String numChar=""+finalStr.charAt(i)+""+finalStr.charAt(i-1);
        formNum=""+getNumber(numChar);
        formNum+=""+getWord(i);
        }
        return formNum;
    }
    public String extractOne(int i,String finalStr){
        String formNum="";
      
        String numChar=""+finalStr.charAt(i);
        formNum=""+getNumber(numChar);
        formNum+=" "+getWord(i);
      
        return formNum;
    }
    public String process(int number){
        String numStr=""+number;
        StringBuffer sb=new StringBuffer(numStr);
        String finalStr=sb.reverse().toString();
        sb=new StringBuffer();
        int i=finalStr.length()-1;
        while(i>=0){
            
            if(i==0){            
                
                sb.append(""+extractOne(i,finalStr));
                i--;
                
            }else if(i==1){   
                sb.append(""+extractTwo(i,finalStr));        
                i-=2;
            }else if(i==2){
                sb.append(""+extractOne(i,finalStr));
                i--;
            }else if(i==3){
                sb.append(""+extractOne(i,finalStr));
                i--;
            }else if(i==4){            
                sb.append(""+extractTwo(i,finalStr));
                i-=2;
                
            }else if(i==5){
                sb.append(""+extractOne(i,finalStr));
                i--;
            }else if(i==6){            
                sb.append(""+extractTwo(i,finalStr));
                i-=2;
            }        
            
        }
        
        return sb.toString();
        
        
    }
    public static void main(String[] args) {
        System.out.println(new NumberToWord().process(1103)); 
        System.out.println(new NumberToWord().process(123456)); 
         System.out.println(new NumberToWord().process(103304)); //1lakh 3thousand 3hundread 4
        System.out.println(new NumberToWord().process(23)); 
        System.out.println(new NumberToWord().process(3)); 
        /*onethousand  onehundread
            onelakh twenty threethousand  fourhundread fifty six
        onelakh  thousand  threehundread
        twenty three
        three
        */
    }  
}