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::::::::::::::
Autonomy.java
::::::::::::::
class Autonomy {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter the mileage for this car (miles/gallon): ");
    double m = console.readDouble();
    System.out.print("Please enter the amount of fuel (in gallons): ");
    double f = console.readDouble();
    System.out.println("The autonomy of the car is: " + m * f + " miles.");
  }
}

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Converter.java
::::::::::::::
class Converter {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter the temperature in degrees Fahrenheit: ");
    double f = console.readDouble();
    System.out.println(f + " degrees Fahrenheit is equal to " + (f - 32) * 5 / 9 + " degrees Celsius.");
  }
}

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::::::::::::::
Distance.java
::::::::::::::
class Distance {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter x_1: ");
    double x_1 = console.readDouble();
    System.out.print("Please enter y_1: ");
    double y_1 = console.readDouble();
    System.out.print("Please enter x_2: ");
    double x_2 = console.readDouble();
    System.out.print("Please enter y_2: ");
    double y_2 = console.readDouble();

    System.out.println("The distance between (" + x_1 + ", " + y_1 + ") and (" + x_2 + ", " + y_2 + ") is: " +
                       Math.sqrt( (x_1 - x_2) * (x_1 - x_2) + (y_1 - y_2) * (y_1 - y_2)));

  }
}

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::::::::::::::
Extract.java
::::::::::::::
class Extract {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter a string: ");
    String a = console.readLine();
    System.out.print("Please enter the first integer: ");
    int i = console.readInt();
    System.out.print("Please enter the second integer: ");
    int j = console.readInt();
    System.out.println("The extracted string is: " + a.substring(i, j));
  }
}

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::::::::::::::
Investment.java
::::::::::::::
class Investment {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter the initial balance (in dollars): ");
    double amount = console.readDouble();
    amount = amount + 0.05 * amount;
    System.out.println("After a year the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After two years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After three years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After four years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After five years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After six years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After seven years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After eight years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After nine years the balance becomes: " + amount);
    amount = amount + 0.05 * amount;
    System.out.println("After ten straight years the balance becomes: " + amount + " dollars.");

  }
}

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::::::::::::::
Max.java
::::::::::::::
class Max {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter the first number: ");
    double a = console.readDouble();
    System.out.print("Please enter the second number: ");
    double b = console.readDouble();
    int max = (int)(Math.round((a + b) / 2 + Math.abs(a - b) / 2));
    System.out.println(max + " is the largest of " + (int)a + " and " + (int)b);
  }
}

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::::::::::::::
Reverse.java
::::::::::::::
class Reverse {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter a string of at most 10 characters: ");
    String b = console.readLine();
    System.out.println("You have entered the string: " + b);
    String a = "          " + b;
    System.out.println(b + " reversed is " +
      a.substring(a.length() - 1, a.length()) +
      a.substring(a.length() - 2, a.length() - 1) +
      a.substring(a.length() - 3, a.length() - 2) +
      a.substring(a.length() - 4, a.length() - 3) +
      a.substring(a.length() - 5, a.length() - 4) +
      a.substring(a.length() - 6, a.length() - 5) +
      a.substring(a.length() - 7, a.length() - 6) +
      a.substring(a.length() - 8, a.length() - 7) +
      a.substring(a.length() - 9, a.length() - 8) +
      a.substring(a.length() - 10, a.length() - 9));


  }
}

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::::::::::::::
Sq.java
::::::::::::::
class Sq {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter a positive number: ");
    double n = console.readDouble();
    System.out.println("We're going to calculate successive approximations of the square root of " + n + " now.");
    double x = 1;
    System.out.println("The first approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    System.out.println("Now we calculate (" + x + " + " + n + " / " + x + ") / 2 for the second approximation");
    x = (x + n / x) / 2;
    System.out.println("which is " + x + ", (and " + x + " squared is: " + x * x + ")" );

    System.out.println("Now we calculate (" + x + " + " + n + " / " + x + ") / 2 for the third approximation");
    x = (x + n / x) / 2;
    System.out.println("which is " + x + ", (and " + x + " squared is: " + x * x + ")" );

    System.out.println("Now we calculate (" + x + " + " + n + " / " + x + ") / 2 for the fourth approximation");
    x = (x + n / x) / 2;
    System.out.println("which is " + x + ", (and " + x + " squared is: " + x * x + ")" );

    System.out.println("Now we calculate (" + x + " + " + n + " / " + x + ") / 2 for the fifth approximation");
    x = (x + n / x) / 2;
    System.out.println("which is " + x + ", (and " + x + " squared is: " + x * x + ")" );

    System.out.println("Now we calculate (" + x + " + " + n + " / " + x + ") / 2 for the sixth approximation");
    x = (x + n / x) / 2;
    System.out.println("which is " + x + ", (and " + x + " squared is: " + x * x + ")" );





  }
}

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::::::::::::::
SquareRoot.java
::::::::::::::
class SquareRoot {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter a positive number: ");
    double n = console.readDouble();
    System.out.println("We're going to calculate successive approximations of the square root of " + n + " now.");
    double x = 1;
    System.out.println("The first approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The second approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The third approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The fourth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The fifth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The sixth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The seventh approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The eighth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The nineth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

    x = (x + n / x) / 2;
    System.out.println("The tenth approximation is " + x + ", \n... and " + x + " squared is: " + x * x);

  }
}

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::::::::::::::
Swap.java
::::::::::::::
class Swap {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter a string of characters (of any length): ");
    String input = console.readLine();
    System.out.println("Here's the string after the swap: " + input.charAt(input.length() - 1) +
                                                              input.substring(1, input.length() - 1) +
                                                              input.charAt(0));
  }
}

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::::::::::::::
Triangle.java
::::::::::::::
class Triangle {
  public static void main(String[] args) {
    ConsoleReader console = new ConsoleReader(System.in);
    System.out.print("Please enter the length of the first side: ");
    double a = console.readDouble();
    System.out.print("Please enter the length of the second side: ");
    double b = console.readDouble();
    System.out.print("Please enter the length of the third side: ");
    double c = console.readDouble();
    double s = (a + b + c) / 2;
    System.out.println("The semiperimeter is: " + s);
    System.out.println("The area of the triangle is: " + Math.sqrt(s * (s - a) * (s - b) * (s - c)));
  }
}


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