toPhrase

Numbers.java

    public static String toPhrase(long l, NumberFormat format){
        String res = "";
        double d = l;
        while(d > 1000){
            if (d >= Math.pow(10, 12)) {
                res = "T" + res;
            } else if(d >= Math.pow(10, 9)){
                res = "B" + res;
                d /= Math.pow(10, 9);
            } else if (d >= Math.pow(10, 6)){
                res = "M" + res;
                d /= Math.pow(10, 6);
            } else if (d >= Math.pow(10, 3)){
                res = "K" + res;
                d /= Math.pow(10, 3);
            }
        }
        if(format == null)
            res = d + res;
        else
            res = format.format(d) + res;
        return res;
    }

    public static void main(String[] args) {
        System.out.println(toPhrase(12345678912l, null));
        System.out.println(toPhrase(12345678912l, DecimalFormat.getCurrencyInstance()));
    }