Real Application (part 1)

import java.io.*;
class Mortgage {
    // Convert double to dollars and cents
    static String format(double dollars)
    {   String numString = Double.toString(dollars);
        int dotpos = numString.indexOf(`.');
        if (dotpos < 0)  // Check if whole number
            return numString;
        // Check if excess fraction digits
        else if (dotpos < numString.length() - 2)  
            return numString.substring(0, dotpos + 3); // `.'+ 2 digits
        else return numString + "0"; // Assume only 1 fraction digit
    }